Piri Reis (Turkish: Pîrî Reis; born Muhiddin Piri; c. 1470–1553) was an Ottoman Turkish cartographer, admiral, navigator, and corsair. He is best known for his 1513 world map and his nautical atlas, the Kitab-ı Bahriye (Book of the Sea). His maps combined classical sources, his own seafaring knowledge, and information from new European discoveries. His cartography was more engaged with the Age of Discovery than other Ottoman works from the period.
Piri Reis began his maritime career sailing with his uncle, the corsair Kemal Reis, with whom he entered Ottoman naval service. He later commanded his own ship in the Ottoman–Venetian wars and, following his uncle’s death, began the cartographic work for which he became best known. In 1516, he took part in the conquest of Egypt.