I'm sorry, but Emperor Wendi did not order the construction of the Great Wall. The Great Wall of China was primarily built during the Ming Dynasty, which was several hundred years after Emperor Wendi's reign. Emperor Wendi, also known as Emperor Wen of Sui, ruled during the Sui Dynasty in the early 7th century. While he did undertake significant construction projects, such as the Grand Canal, the Great Wall was not one of them.
