Otto II of Guelders was a nobleman from the House of Guelders, born around 1371. He became the Duke of Guelders in 1392 and ruled until his death in 1410. Otto II was known for his efforts to strengthen the duchy and maintain its independence during a time of political turmoil in the region. During his reign, Otto II faced challenges from neighboring territories and worked to secure alliances through marriage and diplomacy. His leadership contributed to the development of Guelders as a significant political entity in the Low Countries, influencing the region's history in the late medieval period.