In 1286 Arghun, the Khan of Persia, lost by death his favourite wife Bolgana, and, according to her dying wish, he sent ambassadors to the Court of Peking to ask for another bride from her own Mongol tribe. Their overland route home again was endangered by a war, and they therefore proposed to return by sea.
Kubla yielded to this request, and chose a fair young maiden of seventeen years of age, named Cogalin , who was of the family of the late queen Bolgana, and determined to send her to Argon.
It happened, however, not long after this, that a king of the Indies named Argon, sent three of his counsellors, named Ulatai, Apusca, and Coza, as ambassadors to Kublai-khan on the following occasion. Bolgana, the wife of Argon, was lately dead, and on her death-bed had requested of her husband that he should choose a wife from among her relations in Kathay.