Ireland’s five provinces were ruled over by multiple over and under-kings, with headquarters at Tara, in Midhe/Meath, Cashel in Mumha (later Munster) and Emain Macha in Uladh (later Ulster). Christian settlements from the fifth century (founded by Patrick, Brigid, Columcille, Finnian, Ciarán, Brendan, Íte and many others) forged strong links with Britain and Europe. Learning Latin led to the writing of Irish from the sixth century, and scholarship flourished. Everyone – kings, monks, traders and labourers, bards and the powerful lawyer class, lived in ring fort settlements. They ate mainly the dairy produce abundant in Ireland’s mild climate, meat occasionally, fish near coasts and rivers, pulses, and grains congenial to the region – oats, barley, wheat, rye. A legal tract was devoted to beekeeping. Scandinavian invaders from the late eighth century settled in the trading ports they established – Dublin, Wexford, Waterford, Cork and Limerick – and were gradually absorbed into Irish life. A high-kingship emerged in the tenth and eleventh centuries. Religion went through several cycles of decay and reform. Dioceses were established in 1152. Conflicts between Irish kings facilitated the invasion of the Anglo-Normans under Strongbow in 1169, bringing the English crown into Irish politics.