Rostan de Soler[a] was a 13th-century French knight and administrator who served as lieutenant of the Seneschal of Gascony in 1231 and then Seneschal of Gascony 1241–43.
During his seneschalcy, King Henry III of England, who was also the hereditary Duke of Aquitaine and Gascony, launched the a war against France. One of the lead citizens (prud'hommes) of Bordeaux, he served two terms as mayor there in 1237–38 and 1241.
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