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Thierry d'Alsace (c. 1099 - January 1168), sometimes known as Derry or Dirk, was count of Flanders from 1128 to 1168. He was the youngest son of Duke Thierry II of Lorraine and Gertrude of Flandres.
After the murder of Charles the Good, Thierry was one the claimants for the county. Due to the support of King Louis VI of France, William Clito became count instead. Thierry succeeded after William's death in 1128.
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