|Born||27 December 1716|
|Died||14 May 1786 (aged 69)|
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.