Tractatus Insularii Archipelagi. 76 leaves; paper in a limp vellum binding.

Cristoforo Buondelmonte was from a distinguished Florentine family, who travelled extensively in the Greek archipelago during his life. The volume is dedicated to Cardinal Giardano Orsini, evident from a rubricated acrostic from the beginning of each chapter. There is another copy of Buondelmonte's work at P/13, with both maps and text in a much neater hand.

Administrative / biographical background
This book was particularly important because, though it was never printed, it became the prototype for several later isolarii, or island books, including those of Bartolommeo Sonnetti (P/21), Tommaso Porcacchi (see library catalogue: PBE9533 and PBC4612), and Antonio Millo (P/17).