杨坚 (Yáng Jiān), also known as Emperor Wen of the Sui Dynasty, was a significant Chinese ruler who reigned from 581 to 604 AD. He founded the Sui Dynasty after unifying China, which had been divided into several states for nearly four centuries. His leadership marked the end of the Southern and Northern Dynasties period. Emperor Wen is known for his efforts to strengthen the central government and improve the economy. He implemented various reforms, including land redistribution and the construction of infrastructure like the Grand Canal. His reign laid the groundwork for the subsequent Tang Dynasty, which became one of China's golden ages.