Two main Arabic manuscript traditions of the Nights are known: the Syrian and the Egyptian. The Syrian tradition is primarily represented by the earliest extensive manuscript of the "Nights", a fourteenth- or fifteenth-century Syrian manuscript now known as the Galland Manuscript. It and surviving copies of it are much shorter and include fewer tales than the Egyptian tradition. It is represented in print by the so-called "Calcutta I" (1814–1818) and most notably by the 'Leiden edition' (1984). The Leiden Edition, prepared by Muhsin Mahdi, is the only critical edition of 1001 Nights to date, believed to be most stylistically faithful representation of mediaeval Arabic versions currently available.