Duke Henry XI of Mecklenburg was a German nobleman who ruled the Duchy of Mecklenburg from 1422 until his death in 1477. He was a member of the House of Mecklenburg, a prominent dynasty in northern Germany. His reign was marked by efforts to strengthen the duchy's political and economic stability during a time of regional conflict. Henry XI is known for his diplomatic skills and alliances, which helped maintain peace in the region. He also supported the development of trade and commerce, contributing to the prosperity of his territory. His legacy includes the promotion of Mecklenburg's cultural and economic growth during the late Middle Ages.