贵由
In 1238, when the Mongols first invaded Kievan Rus and his elder brother Yuri was killed in battle, Yaroslav left Kiev for Vladimir, where he was crowned grand prince. Yaroslav attempted to restore the cities of Vladimir-Suzdal after the Mongol ravages and fires. In 1243, he was summoned by Batu Khan to his capital Sarai. After a lengthy conference, he returned to Vladimir with honours. Two years later, he was again summoned to the east, this time by Güyük Khan in Karakorum. There he was poisoned by the Great khan's mother Töregene and died a week after he had been allowed to return home.