In 1207, the Mongol ruler Genghis Khan (r. 1206–1227) conquered and subjugated the ethnic Tangut state of the Western Xia (1038–1227). In the same year, he established diplomatic relations with Tibet by sending envoys there. The conquest of the Western Xia alarmed Tibetan rulers, who decided to pay tribute to the Mongols. However, when they ceased to pay tribute after Genghis Khan's death, his successor Ögedei Khan (r. 1229–1241) launched an invasion into Tibet. COUNT 4
QSN1 Which ruler took Western Xia under their control? ANS1 Genghis Khan QSN2 Who was Genghis Khan's successor?  ANS2 Ögedei Khan QSN3 What years did Ögedei Khan rule? ANS3 1229–1241 QSN4 Who invaded Tibet?  ANS4 Ögedei Khan