Chlothar I was a king of the Franks who ruled from 511 to 561 AD. He was one of the sons of Clovis I, the first king of the Franks, and played a significant role in the early formation of the Frankish kingdom. Chlothar I expanded his territory through conquests and alliances, becoming a prominent figure in the Merovingian dynasty. During his reign, Chlothar I was known for his efforts to unify the Frankish tribes and maintain control over his kingdom. He ruled over a large area that included parts of modern-day France and Germany. His leadership helped lay the groundwork for the future expansion of the Frankish Empire.