Cosmographia et geographia de Affrica in the context of Biblioteca Nazionale Centrale di Roma

Johannes Leo Africanus (born al-Ḥasan ibn Muḥammad ibn Aḥmad al-Wazzān al-Zayyātī al-Fasī, ; c. 1494 – c. 1554) was an Andalusi diplomat and author who is best known for his 1526 book Cosmographia et geographia de Affrica, later published by Giovanni Battista Ramusio as Descrittione dell'Africa (Description of Africa) in 1550, centered on the geography of the Maghreb and Nile Valley. The book was regarded among his scholarly peers in Europe as the most authoritative treatise on the subject until the modern exploration of Africa. For this work, Leo became a household name among European geographers. He converted from Islam to Christianity and changed his name to Johannes Leo de Medicis (Arabic: يوحنا الأسد, romanized: Yuḥannā al-Asad). Leo possibly returned to North Africa in 1528.

Description of Africa was taken largely from the firsthand geographical work Cosmographia et geographia de Affrica completed by Leo Africanus in 1526 and published under the title Della descrittione dell’Africa et delle cose notabili che ivi sono by Giovanni Battista Ramusio in his collection of travellers' accounts Delle navigationi e viaggi in Venice in 1550. It contained the first detailed descriptions published in Europe of the Barbary Coast (modern Morocco, Algeria, and Tunisia) and the gold-trading kingdoms of west-central Africa. The book was dictated in Italian by Leo Africanus, the famed Moorish traveler and merchant who had been captured by pirates and sold as a slave. Presented, along with his book, to Pope Leo X, he was baptized and freed. Leo, whose name he took in baptism, suggested that he recast his Arabic work in Italian; it was completed in 1526. It was republished repeatedly by Ramusio in his Delle navigationi e viaggi, translated into French and into Latin for the erudite, both in 1556.

The Descrittione is in nine books, an introductory book and an appendix on rivers and fauna and flora, with seven books between, each describing a kingdom: the kingdoms of Marrakesh, Fez, Tlemcen and Tunis, and the regions of Numidia, the sub-Saharan regions, and Egypt. The work circulated in manuscript form for decades. It was in Ramusio's manuscript that Pietro Bembo read it and was astonished: "I cannot imagine how a man could have so much detailed information about these things", he wrote to a correspondent, 2 April 1545.