Trpimir I was a notable ruler of the early Croatian state, reigning in the 9th century. He is recognized for his efforts to consolidate power and expand the territory of Croatia. His reign marked a significant period in the development of Croatian identity and governance. Trpimir I is also known for his diplomatic relations with the Byzantine Empire, which helped to strengthen Croatia's position in the region. He is often credited with promoting Christianity in Croatia, contributing to the cultural and religious landscape of the time.