Gaspar de Vallier was a Marshall of the Knights of Malta, who was in command of the fortress of Tripoli during the Siege of Tripoli (1551). He was French, from the region of Auvergne ("Langue d'Auvergne"). In Tripoli, he commanded 30 knights (some authors say 200) and 630 Calabrian and Sicilian mercenaries. The city was captured on 15 August 1551.
De Vallier was later rehabilitated by Grand Master Jean Parisot de Valette.
- The Papacy and the Levant (1204-1571) by Kenneth M. Setton p.555-
- The Mediterranean and the Mediterranean world in the age of Philip II by Fernand Braudel p.920- 
- Achievements of the Knights of Malta Alexander Sutherland p.108
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