Gaston IV (died 1131) was viscount of Béarn from 1090 to 1131. He was called "le Croisé" ("the Crusader") due to his participation in the First Crusade.Gaston succeeded his father Centulle V in 1090. During his rule, the borders of Béarn were established more definitively; he defeated the viscount of Dax, and took control of Orthez, Mixe, and Ostabaret by 1105.
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