original: He reigned from 1804 to 1824.
simplifications: He was in power from 1804-1824. He was in power from 1804 to 1824. He ruled 1804 - 1824. He held the throne from 1804 to 1824. He ruled from 1804 to 1824. He ruled 1804 to 1824. He ruled between 1804 and 1824. He ruled from 1804 to 1824. He ruled from 1804-1824. He ruled from 1804 to 1824.