The Geography, also known by its Latin names as the Geographia and the Cosmographia, is a gazetteer, an atlas, and a treatise on cartography, compiling the geographical knowledge of the 2nd-century Roman Empire. Originally written by Claudius Ptolemy in Greek at Alexandria around 150 AD, the work was a revision of a now-lost atlas by Marinus of Tyre using additional Roman and Persian gazetteers and new principles. Its translation into Arabic in the 9th century was highly influential on the geographical knowledge and cartographic traditions of the Islamic world. Alongside the works of Islamic scholars – and the commentary containing revised and more accurate data by Alfraganus – Ptolemy's work was subsequently highly influential on Medieval and Renaissance Europe.

Giacomo or Jacopo d'Angelo, better known by his Latin name Jacobus Angelus, was an Italian classical scholar, humanist, and translator of ancient Greek texts during the Renaissance. Named for the village of Scarperia in the Mugello in the Republic of Florence, he traveled to Venice where the Byzantine emperor Manuel II Palaiologos' ambassador Manuel Chrysoloras was teaching Greek, the first scholar to hold such course in medieval Italy.