King Clotaire I was a Merovingian king who ruled over the Franks from 511 to 561 AD. He was the son of Clovis I, the first king of the Franks, and played a significant role in unifying the Frankish tribes. Clotaire I expanded his kingdom through military conquests and strategic marriages, becoming one of the most powerful rulers of his time. During his reign, Clotaire I established a centralized government and promoted Christianity, which helped to strengthen the influence of the Catholic Church in the region. His reign marked a crucial period in the early history of France, laying the groundwork for future Frankish kings.