For some thirty years before his death (ante 21 November 1338) Andrea Sapiti acted as proctor at the Curia of the Avignonese popes. His register, an office resource, owing its compilation probably to professional factors, by its mere existence testifies to his organisation. Preserved in Vatican City, Biblioteca Apostolica Vaticana, ms Barberini Latini 2126, and reflecting mainly his activity from 1330 to 1337, it comprises two sections. The first is a miscellany including such basic orientation for a curial agent as a listing of cardinals and a Provinciale of the Roman Church, an early fourteenth-century taxation of Florentine benefices (reflective equally perhaps of Sapiti's continued concern with ‘local’ business and of the need in personal terms to be informed – Andrea's son Remigio, a Cistercian monk and master of theology at Paris, was provided by Benedict xii in 1338 as abbot at a troubled juncture of S. Salvatore in Settimo and other letters in the miscellany relate to Sapiti beneficiary affairs) and documents putatively relating to business in which Andrea was active, including the notable rarity of the opinion of a curial advocate on an English case. The second (containing eighty-five distinct entries, some composite) is entitled ‘Quaternus supplicationum’, although as it stands it is not quite homogeneous. The register underwent updating and extension from use after Andrea's death. Barbara Bombi's introduction both considers the documents for their historical and administrative reference and presents a satisfyingly concrete account of a career that branched out from the Florentine quarter of S. Iacopo d'Oltrarno, through work for the Signoria, to Rome and onto the international plane. Here, probably from engagement by Walter Reynolds, royal treasurer and later archbishop, Sapiti began service with Edward ii, surviving both the fall of the Frescobaldi – with whom he had long-standing links – and wider crises to continue under Edward iii. His brand of ad hoc diplomacy filled a contemporary gap. The editing is meticulous. Some minor corrections noted may serve the user of particular matter. At p. 90, line 34, read ‘pauperimi, numero triginta quatuor’. In that document, the see ‘Clunensis’ identified at n. 14 (p. 92) is, by geography, Clonmacnois not Cloyne (for which there is a separate proposal of union). At p. 104, line 8, the sense suggests that the omitted reference be to Edward II not Henry II. At p. 147, line 22, the comma between ‘processus’ and ‘faciendos’ obscures the sense. The Henrys at p. 227 (ii (i) n. 1) and p. 311 (lviii n. 15) are father and son respectively: the latter supplication more probably documents the attachment by then of John de Gynewell (future bishop of Lincoln) to Henry de Grosmont's service. Such a treatment of this important source has long been needed: historians are well served by the standards of scholarship and production achieved.