Duke Otto I of Bavaria, born in 1180, was a significant figure in the medieval history of Bavaria. He belonged to the Wittelsbach dynasty and ruled from 1231 until his death in 1253. Otto I is known for his efforts to strengthen the power of the duchy and for his involvement in the political affairs of the Holy Roman Empire. During his reign, Otto I worked to consolidate his territory and improve its administration. He also played a role in the conflicts between the Hohenstaufen dynasty and the papacy. His leadership contributed to the development of Bavaria as an important political entity in central Europe.