2. THE VESSEL

Based on the description of the passage, and the number of the crew, it is clear that the vessel was a sailing ship, possibly with one or two pairs of oars for manoeuvering in harbour.Footnote ⁵ It is not stated whether the ship was equipped with a lateen or a square sail. Casson, basing his analysis on linguistic arguments, suggests she was a lateener.Footnote ⁶ Meijer, from similar arguments, writes of ‘a common square-rigged ship’.Footnote ⁷ Meijer’s opinion seems more logical, and the following points may be added to his argument:

• ● Refining Meijer’s comment slightly: ‘There are no representations of lateeners with more than one sail’,Footnote ⁸ two-masted lateeners were apparently introduced later.Footnote ⁹

• ● After doubling the temple of Poseidon they sailed ‘with all sails (plural) spread’.Footnote ¹⁰

• ● The square sails of the large merchant shipsFootnote ¹¹ did not attract Synesius’ attention as being different. Of course, this could have been a result of his limited knowledge and experience.

• ● The ship continued to sail for a day and night with a broken yard, and arrived at her destination. This could not have happened if she had merely drifted or progressed only under a mainsail with a broken yard – she must have had at least one additional (auxiliary) sail. This additional sail was unlikely to have been a lateen sail, for the reason given above.

Comparing with other evaluations,Footnote ¹² and as will be discussed below, the vessel could travel about 80 degrees to the true wind over the ground, slightly better than the 90 degrees proposed by Pryor.Footnote ¹³

3. THE DATE OF THE PASSAGE

Fitzgerald suggested that the ship sailed on 28th January, 404 CE, although the years 396, 397, 402, 404, 410 and 413 have also been mentioned by him as proposed by others.Footnote ¹⁴ Meijer proposed January 402.Footnote ¹⁵ Garzya leaves open alternatives between January and May 402.Footnote ¹⁶ Rubin mentions these various datings of the passage, and also includes May 28, 401 and September 410.Footnote ¹⁷

Two sources of data allow us to determine the season and date of the sailing: astronomical data and the weather.

3.2. Weather conditions

Sailing seasons, and the weather conditions which defined them, also add a little to the evidence of the date of the passage. The analysis is based on data given in the Mediterranean Pilot,Footnote ¹⁹ assuming that the weather has not changed significantly since antiquity.Footnote ²⁰ Sailing seasons have been discussed by notable scholars.Footnote ²¹ The winter months, November to March, are out of the sailing season. Gales, according to the Mediterranean Pilot, are most frequent between December and February.Footnote ²² Thus the passage most probably took place between March and October.

Summaries from the Mediterranean Pilot data are given in the tables. The probabilities of open sea wind directions are given by two different wind roses that cover the relevant area.Footnote ²³ Their average is shown in Table 1. Because of the low probability of winds from southern directions, the omission of July and August as the passage months is also suggested.

Table 1.

Average wind probabilities for an open sea passage (%).

The daily land breeze is given in the Alexandria (El Iskandarîya) climatic table.Footnote ²⁴ The summaries of wind probability from southern directions (SW, S, SE) and northern directions (NW, N, NE) are presented in Table 2.

Table 2.

Summaries of daily winds from southern and northern directions (%), and rain, at 0800 and 1200 at the Alexandria land station.

The average wind is given as percentage probabilities for selected months at Alexandria (El Iskandarîya) and Darnah land stations in Table 3.Footnote ²⁵

Table 3.

Averages of Alexandria and Darnah land station climatic tables for selected months (%).

On the first day it is mentioned that there was a south wind for a short while. This was perhaps a local phenomenon, not a morning land breeze, since it is reported during the afternoon. On the fifth and sixth days a continuous south wind is reported out to sea, which must have been the result of a weather system, and not a daily land breeze. This was not typical of the high summer months.Footnote ²⁶

Rain is reported towards the end of the passage. The rain data given for Alexandria more or less represents the relevant north Egyptian and Libyan coasts. The period from June to September, when actually no rain falls in this area, may be excluded. It sometimes rains in spring and autumn,Footnote ²⁷ so the passage could have been made in either of these seasons.Footnote ²⁸

No matter what the season, the prevailing wind in this region is northwest, while with only very few exceptions, north and west winds are the next frequent, whether close to land or in the open sea. Wind direction described by Synesius should not be interpreted literally; as a seaman may sometimes describe the character of the wind rather than its exact direction. For example, if the prevailing northwest wind blows moderately with short, small but strong waves with ‘white horses’, a seaman may call a north wind producing the same effect a ‘northwest’ wind.Footnote ²⁹

4. ANALYSIS OF THE PASSAGE

(see Figure 1). The ship set out at ‘early dawn’, or first light. The reason for this timing seems clear: the morning land breeze from the south. As shown in Table 2, in the morning (0800) there is a chance of a favourable wind for leaving the harbour. This is probable only in the spring and autumn. However, the advantage of an early morning start made it difficult to judge depth in the poor light or because of the reflections of the low sun, which resulted in touching ground right at the beginning. This was not an exceptional event, since Synesius himself does not know whether it happened two or three times. The harbour of Alexandria was, and still is, shallow, with many reefs. Rocks, submerged and just breaking the surface, extend two nautical miles from the shoreline. Pharos Island is slightly protected by a line of rocks and obstacles stretching northeast-southwest. These hindered the ship, and the chance of clearing the harbour before the prevailing northwest wind got up was missed. Thus, the ship had to struggle out of the harbour and double the Pharos point against the wind. It is not mentioned how the ship got out of the shallows and sailed northward; presumably it was aided by a harbour tug,Footnote ³⁰ or other means. Meshullam of Volterra describes how his ship grounded and was refloated at Alexandria, about one mile from the shore.Footnote ³¹ Interestingly, the earliest account of taking soundings comes from the same coast.Footnote ³² By noon, half a day after starting, they arrived at the Pharius Myrmex (Pharos), a mile from the shore.

Figure 1.

A suggested solution for Synesius’ passage (Drawing S. Haad).

As the ship left the harbour she changed course to southwest on the starboard tack. The Temple of Poseidon was located on the western edge of the Island of Pharos.Footnote ³³ At this point the skipper faced a dilemma. Apparently, there was the prevailing northwest wind, which is confirmed by the ship’s manoeuvers. The destination was slightly north of west, actually 285°. But the shore, for about 45 nautical miles, tended in a general southwest direction towards Taposiris (about 240°). Instead of beating generally northwards, and actually northeast, further away from his destination, Amarantus chanced a more direct course, parallel to the shore. He could hope for a good passage and perhaps a change in the wind direction towards his destination, and evidently all sails were spread. Apparently the ship could raise at least two sails, mainsail and artemon.

As it happened, things became slightly more complicated, and they approached rocks that were observed even by landsmen. The chart of the area clearly shows rocks showing above water a few miles from the shore. There was no choice but to turn and sail on the port tack on a northeasterly course. As suggested above, they could make 80° degrees to the wind, thus the alternate course was not much better than about 040°.

They could, however, gain very little mileage to windward over the ground. At some point the wind changed and blew from the south, perhaps the change that Amarantus expected from his local knowledge. The south wind gave the ship more freedom on its north-west course, while gaining some distance from the coast, in the expectation of another change in the wind. When a ‘stormy’ north wind started the ship turned to a generally westward course on the starboard tack. Being far enough from the shore enabled her to progress westward, with some leeway towards the south, but safely clear of shallow waters.

The description of the wind change is convincing, and typical of this phenomenon in the Mediterranean. The sails that were trimmed to a south wind on the port tack on a general northwestern course became concave instead of convex. This perhaps could have been part of the tacking manoeuvre. This wind change from the south to northwest can be recognized on the surface of the sea and can happen within a few minutes. Once the wind changed to northwest Amarantus sheeted in the sails on the starboard tack, which is a natural reaction and good seamanship. All these manoeuvres were explained to Synesius.

Figure 1 and Table 4 set out Synesius’ route as proposed. It is a sort of optimization, slightly more complicated than by ‘compass and divider’, as suggested by Casson,Footnote ³⁴ but with almost no degrees of freedom. The constraints are the positions of Alexandria, the rocks near Taposiris, the stop-over on the coast, and Azarium, the destination. Although the stop-over is not precisely defined, the shoreline itself is a reference, and its position can be explained. Similarly, the wind direction, the tacking angle, the course and the speed, do not give much room for alternatives.

Table 4.

A possible route.

The hypothetical route is a result of calculations considering the above constraints. For example, increasing the close-hauled tacking angle (e.g. from 80° to 90°) means a longer passage, which demands a higher speed or more time, but the assumed speed of 6 knots is perhaps already too high. The time of passage is also constrained by the ‘noontime’ departure from Alexandria, and ‘daylight’ while sailing with the north wind, after the south wind, on the afternoon of the first day. Thus, since setting out from Alexandria harbour about midday, they sailed not more than seven hours until darkness fell.

At least four hours’ sailing are required for the approximately 25 miles from Alexandria to Taposiris. Given approximately one hour’s sailing after turning near Taposiris, and one and a half hours for the south wind, this brings the time to about 6.30 pm. Considering sailing with the north wind in daylight, and the events described after the coming of the Jewish Sabbath at sunset, this seems reasonable.

During the following hours Amarantus, who was Jewish, as were some of his crew, observed the Sabbath by allowing the ship to drift; but only because the wind had dropped and allowed him to do so safely. Without wind, but with a swell remaining at the end of the first day’s sailing, they could do nothing, except wait and pray, devoting this break to their personal religious rituals.

Towards the middle of the night the wind rose again. Amarantus resumed control, conforming to the Jewish precept that saving life takes precedence over observing the Sabbath, and sailed continuously until the fourth hour of the day, when they arrived at the shore, after about 30 hours at sea. From the description of the difficulties, and the next two days ashore waiting for the wind and the sea to quieten, a northwest prevailing wind is postulated. If the wind had been from a southerly direction they would have had no reason to stop; and as they were close to the shore, their view of the sea would not have been reported as tempestuous. The ship was safely riding in the open sea – not in a harbour – to her sole anchor, which could not have held against a violent sea or wind, which implies nothing more serious than a typical seasonal gentle-to-moderate northwestern wind.

The purpose of their landing is not clear; perhaps after Friday night’s events Amarantus gave the passengers the alternative of travelling overland to their destination, which they did not do. Perhaps, realizing their discomfort while sailing, he preferred to let them rest in a well-known place, expecting a continuous unfavorable wind and sea. The passage track and the chart give a clue to another possibility. Amarantus sailed with a northwest wind close-hauled on the starboard tack. As he approached the coast he could see Râs el Hekma, (also known as Râs el Kanâyis) on his starboard bow. Doubling this cape needed difficult tacking in unfavorable conditions for more than ten miles. On the other hand, the cape gives some shelter from the northwest wind, and several small anchorages (mersa) exist to its east.Footnote ³⁵ Local knowledge is needed to manoeuvre between the reefs and to anchor safely. Therefore, Amarantus anchored in daylight, preferring a stop-over to fighting the sea. Whether he might have done the same had he sailed without passengers, or continued to tack against the wind and sea, remains speculative.

By the way, the norm of carrying three anchors is reported, similarly to the four anchors cast by St. Paul’s vessel,Footnote ³⁶ and more than one of the later ships of Ibn Jubayr.Footnote ³⁷ The ship in which Felix Fabri returned from the Holy Land also had more than one anchor.Footnote ³⁸ The existence of a small service boat with which they landed is explained by the passengers’ actual landing while the ship anchored in the open sea. A similar boat is mentioned in St. Paul’s journeyFootnote ³⁹, and in the later descriptions of the passages of Ibn JubayrFootnote ⁴⁰ and Meshullam of Volterra.Footnote ⁴¹ The galley of Felix Fabri carried more than one boat at the stern.Footnote ⁴² Two boats are beautifully represented in the Torlonia relief.Footnote ⁴³

The difficulties of handling wet sail and rigging during the night are well expressed; whether replacing the sail (according to Casson), or reducing its area by brailing it (according to Meijer). The authenticity of the maritime illustrations is corroborated by the description of highly-tensioned ropes and jammed blocks.Footnote ⁴⁴

Almost 48 hours were passed on shore, then early in the morning of the fourth day, a favourable southerly wind arose, carrying the ship on for about 36 hours. Being experienced seamen, and expecting a change of wind to northwest–north, they probably sailed to the north of their destination. The general line of the coast from their landing point to Azarium is 290°, and the suggested course is 305°. While making the maximum under the circumstances towards the destination, a considerable distance from the shore was gained. Their suggested speed is 5.5 knots (6 knots seems slightly too fast; and if slower, the ship would not have reached Azarium within the reported time). When the wind changed to north-by-west, which was the prevailing wind, together with heavy rainfall, they made for Azarium. Once again, the ship sailed on a generally westward course, with the experienced Amarantus gaining enough distance to the north, but not too much, in order to sail directly to his destination. It seems that Synesius, although uncomfortable, admits the advantage of this wind. The analysis suggests they reached about 60 nautical miles from the coast, out of sight of land. This was not a long tack: it was optimizing the route to the destination, using the south wind to gain some distance to the north, with the expectation of the wind changing to northwest. Amarantus had made some spare miles of sea-room, just in case – excellent seamanship.

Once the northwest wind started they faced problems with the sail. Synesius dramatically describes how the yard broke and almost killed them all, although nobody was actually harmed. Similar events are described in the first journey of Ibn Jubayr, when the yard fell twice, and that of Meshullam of Volterra, when the yard fell; with nobody being harmed in either case. Likewise nothing happened to the crew or passengers of the galley in which Felix Fabri sailed, after the torn mainsail was replaced.Footnote ⁴⁵

The ship sailed slowly for a day and a night, and in the morning of the seventh day arrived exactly at her destination. The ship was under control, although not at her maximum speed under full sail. Because the mainsail could not be efficiently used, apparently only the small second sail was used. Amarantus was ready, his speed was reduced, and he had gained a few spare miles to the north. It is estimated that at least an additional 5° has to be added to the leeway, and the speed is assumed at slightly less than 3.5 knots. As stated above, not many alternatives exist in calculating the route. Thus it seems impossible that the ship drifted with the northwest wind towards Azarium under bare poles. On the other hand the ship did not ‘run’ in the usual meaning of the word – sailing with the wind well abaft – rather she was carried along. The same applies to the description of sailing towards the stop-over shore, which is translated as ‘running’ under full sail.

The ship did not ground on the reefs off the entrance to Azarium. The text itself, if carefully read, describes a close approach, but not an actual grounding,Footnote ⁴⁶ and the subsequent events are not those of a ship that touched rocks while sailing. The description of the actions of the crew is of a safe arrival in a strong wind with a malfunctioning rig at night at a dangerous harbour with reefs near the entrance, and then waiting to be piloted in daylight.

The question of navigation, however, remains open. How did Amarantus navigate by night in heavy weather precisely to port? No clue to navigational aids or methods is given. It was not merely coastal navigation, since they also sailed far out of sight of land.

The journey ended at Azarium; thus the exact course can be estimated with some confidence. In Table 4, which corresponds to Figure 1, one possible solution, which summarizes the above details, is suggested.

The pilot tied up his harbour service boat to the ship, came aboard, and directed the ship. He sailed the ship about five nautical miles to her mooring inside the harbour. The pilot then guided five more vessels into the harbour. Despite Synesius’ terrifying tale, Amarantus had proved his skills by actually arriving in harbour a day earlier than ships that set out from Alexandria a day before him.