Thibaut IV tēbō´ [key], 1201–53, French trouvère, count of Champagne. He became Thibaut I, king of Navarre, in 1234, succeeding his uncle Sancho VII. He was defeated while leading a Crusade (1239), but he returned to become a poet and composer of first rank. Some of his songs and courtly verses are addressed to Blanche of Castile, regent of France.
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