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Leonardo Ximenes (27 December 1716 – 4 May 1786) was a famous Italian Jesuit [1] mathematician, engineer, astronomer and geographer from Sicily.

Leonardo Ximenes
Leonardo Ximenes.jpg
Born(1716-12-27)27 December 1716
Trapani, Italy
Died14 May 1786(1786-05-14) (aged 69)
Florence, Italy
Scientific career

After having attended a Jesuit school, he became a mathematician, a hydraulic and civil engineer, and was an eminently respected astronomer in his day. The astronomical observatory, Osservatorio Ximeniano in Florence, is named after him in recognition of his services to the field. As a hydraulic engineer, he is known for building canals, including the Imperial Canal in Tuscany. These canals were part of an effort to drain the Lago di Bientina, at the time the largest lake in Tuscany.


  • Ximenes, Leonardo (1780). Nuove sperienze idrauliche fatte ne' canali, e ne' fiumi per verificare le principali leggi e fenomeni delle acque correnti dell'abate Leonardo Ximenes ... In Siena: nella stamperia di Luigi, e Benedetto Bindi.



  1. ^ [1]XIMENES, Leonardo Enciclopedia Italiana (1937).