Theodoric I (thēŏd´ərĬk) or Thierry I (tērē´, tēĕr´ē), d. 534, Frankish ruler, son of Clovis I. On his father's death (511) he shared equally with his brothers, Clodomer, Childebert I, and Clotaire I, in the division of the Frankish kingdom. His capital was at Reims. With Clotaire he subjugated the Thuringians. He was succeeded by his son Theodebert I, who was king (534–48) of the West Frankish kingdom of Austrasia, and by his grandson, the last member of Theodoric's line, Theodebald (reigned 548–55).