Knowra Piri Reis Piri Reis Piri Reis was an Ottoman admiral, navigator, and cartographer known for a surviving fragment of his 1513 world map and the nautical guide Kitab-ı Bahriye.
Portolan chart : A nautical chart that depicts coastlines, ports, and rhumb lines for maritime navigation. The 1513 map belongs to a chartmaking tradition centered on coasts and sailing routes.
1513 Piri Reis map : A fragmentary world map drawn by Piri Reis in 1513, surviving in the Topkapı Palace collections. This celebrated chart is the work most closely associated with his name.
Kemal Reis : An Ottoman corsair and admiral active in the late fifteenth and early sixteenth centuries. Piri Reis served under his uncle Kemal Reis and gained early seafaring experience.
Ottoman cartography : The production and use of maps within the Ottoman Empire, drawing on regional and transregional geographic knowledge. Piri Reis became one of its best-known practitioners through maps and sailing guides.
Rhumb line : A path crossing every meridian at the same angle, appearing as a straight line on a Mercator projection. Portolan charts use networks of these lines to represent navigational bearings.
Kitab-ı Bahriye : A sixteenth-century Ottoman nautical guide by Piri Reis, describing Mediterranean coasts, ports, and sailing conditions. The guide expands his work from a world map into practical regional sailing directions.
Battle of Zonchio : A 1499 naval battle in which Ottoman forces defeated a Venetian fleet near the Ionian coast. Piri Reis took part in Ottoman naval campaigns during this period.
Iberian nautical charts : Sailing charts produced in Portugal and Spain during the early modern period, recording ocean routes and newly charted coasts. His 1513 map incorporated information from Iberian charts and voyages.
Dead reckoning : A method of estimating position from a known starting point, course, speed, and elapsed time. Sailors needed this method when shore landmarks or reliable astronomical fixes were unavailable.
Topkapı Palace : A palace complex in Istanbul that served as the Ottoman sultans' principal residence and administrative center. The surviving fragment of the 1513 map is held in its collections.
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