sentences:  When Caizhou also came under Mongol attack in 1234, he passed the throne to his army marshal Wanyan Chenglin and then died by suicide by hanging himself.Ningjiasu was the third son of Emperor Xuanzong.His mother was Emperor Xuanzong's concubine, Lady Wang (王氏), who was posthumously honored as "Empress Minghui" (明惠皇后).