Arab mathematician from Maragha, astronomer at Hulagu Khan, grandson of the conqueror Genghis Khan and brother of Kublai Khan. An important mathematician of non-Euclidean geometry, he also made remarkable contributions to plane and spherical trigonometry and astronomy, where his conclusions were even used by Copernicus.
It seems that it was from his work that Regiomontanus decided to organize trigonometry as a discipline independent of astronomy. His work was translated by Wallis in the seventeenth century and basic to Saccheri's studies in the early eighteenth century. He died in Kadhimain, near Baghdad, Iraq.
Source: Biographies - Academic Unit of Civil Engineering / UFCG
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COSTA, Keilla Renata. "Nasir Eddin al-Tusi"; Brazil School. Available in: https://brasilescola.uol.com.br/biografia/nasir-eddin.htm. Accessed on June 28, 2021.