Who is Zhu Di from When China Ruled the Seas: The Treasure Fleet of the Dragon Throne, 1405-1433 and what is their importance?

The third Emperor of the Ming Dynasty, also known as the dragon throne, was Zhu Di. When his father Zhu Yuanzhang, the first Ming Emperor, died he left orders that disallowed any of his sons from succeeding him. Instead, Zhu Yuanzhang's grandson, Zhu Yunwen, became the second Ming Emperor. Zhu Yunwen held the throne only a short time, when Zhu Di forced him out and reclaimed the dragon throne.