On arrival at the supreme Mongol court – either that on the Imyl river (near Lake Alakol and the present Russo-Chinese frontier in the Altai), or more probably at or near Karakorum itself, south-west of Lake Baikal – André found Güyük Khan dead, poisoned, as the envoy supposed, by Batu Khan's agents. The regent-mother Oghul Qaimish (the "Camus" of William of Rubruck) seems to have received and dismissed him with presents and a dismissive letter for Louis IX. But it is certain that before the friar had left "Tartary", Möngke, Güyük's successor, had been elected.