Frederick I, Duke of Lorraine, was a nobleman who ruled from 1047 until his death in 1070. He belonged to the House of Lorraine, a prominent family in medieval Europe. Frederick was known for his military leadership and played a significant role in the political landscape of the region during his reign. As Duke, Frederick I worked to strengthen his territory and maintain its independence amid the power struggles of neighboring states. He was also involved in the broader conflicts of the time, including the Investiture Controversy, which pitted secular rulers against the authority of the Pope. His legacy influenced the future of Lorraine and its governance.