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Thaumastus I (also called Thaumaste I) (born c. 400)[1] was a friend and uncle of Sidonius Apollinaris. His brother, the elder Apollinaris was born around 405[2] and was the Prefect of Gaul under Valentinian III between 425 and 455.[3] Thaumastus and his brother were both sons of another Apollinaris, Praetorian Prefect of Gaul before 409[4] and were friends with his successor Decimus Rusticus. Thaumastus was associated with Tonantius Ferreolus in the impeachment of Arvandus[5]. He was the father of Eulalia, born in 425[2] and married before 450 to Flavius Probus, Roman Senator. He seems to be a descendant of another Apollinaris, Prefect of Gaul under Constantine II between 337 and 340.[3]