The Corbitis atlas was once believed to be dated 1368 (on account of a misreading of the label y(sole) 368 on the fifth folio).
[1] The map has the simple inscription "hec tabula ex testamento d[omi]nj nicholaj de co[r]bitis deuenit monast[eri]o cart[husiano] flore[ntino]",[2] implying the Corbitis atlas must have belonged to a certain Corbizzi family of Florence in the 14th century, and was held by the monastery of Certosa del Galluzzo.
The inscription was previously misread as "Combitis", a name by which the atlas is sometimes referred to in older sources.
The Corbitis atlas is composed of four portolan charts, each measuring 31 × 19 cm, with each chart covering two folios: The third sheet (North Atlantic) includes the mythical islands of y.fortunate, y beate, y.368 and the montagna de sco brandan (Saint Brendan's Island).
The fourth sheet (South Atlantic) covers the west African coast down to inbugder (Cape Bojador) and several Atlantic islands, using the same labels found already in earlier charts (e.g. the 1351 Medici Atlas, the 1367 Pizzigani brothers chart, etc.).