Sultan Hamengkubuwono I was the first ruler of the Yogyakarta Sultanate in Indonesia, established in 1755. He played a crucial role in the political landscape of Java during the Java War and was known for his efforts to maintain the independence of his kingdom amid colonial pressures. He was born in 1714 and became a prominent leader after the signing of the Giyanti Agreement, which divided the Mataram Sultanate. Sultan Hamengkubuwono I is remembered for his contributions to the cultural and political development of Yogyakarta, laying the foundation for the sultanate's enduring legacy.