Duke Otto II of Bavaria was a member of the House of Wittelsbach, born in 1206. He became Duke of Bavaria in 1253 and ruled until his death in 1257. Otto II was known for his efforts to strengthen the duchy and maintain peace during a time of political instability in the region. During his reign, Otto II worked to consolidate power and improve the administration of his territory. He was also involved in various alliances and conflicts, which were common among the nobility of the time. His leadership contributed to the development of Bavaria as a significant political entity in Holy Roman Empire history.