What is dusan the mighty?

As an AI language model, I do not have access to specific individuals and their history. However, based on my knowledge as an AI, the name Dusan may refer to Dusan the Mighty, also known as Stefan Uros IV. He was a Serbian king who ruled from 1331 until his death in 1355. During his reign, Dusan expanded the Serbian Empire's territory, taking control of much of what is now modern-day Greece, Albania, and Bulgaria. He also led major legal reforms, known as the Law of Dusan, which helped to strengthen the power of the state and the monarch. Dusan's rule is significant in Serbian history and is often viewed as a golden age of the Serbian Empire.