sentences:  Empress Gao did not follow him, but no formal divorce was ever proclaimed by either side, and Emperor Xiaowu did not create another empress.Gao subsequently declared Emperor Xiaowu's distant nephew Yuan Shanjian the Heir Apparent of Qinghe emperor (as Emperor Xiaojing), creating the split between Eastern Wei (with Emperor Xiaojing as its emperor) and Western Wei.Around the new year 535, Yuwen, whose own relationship with Emperor Xiaowu had deteriorated after he refused to condone Emperor Xiaowu's incestuous relationships with his cousins and had killed Yuan Mingyue (元明月) the Princess Pingyuan, who was having a relationship with Emperor Xiaowu, poisoned Emperor Xiaowu to death.