那海
Initially, Ivaylo was received well by Nogai Khan. When news of his whereabouts reached Constantinople, Michael VIII sent Ivan Asen III with rich gifts to the Mongol court to ask assistance. Nogai Khan expressed interest in the issue and for several months kept promising help to both pretenders. Eventually the Byzantine influence prevailed because the Mongol leader was married to the illegitimate daughter of Michael VIII, Euphrosyne Palaiologina. During a feast, in which Ivaylo and Ivan Asen III seated on both sides of Nogai Khan, he pointed at Ivaylo with the words "He is an enemy of my father, the Emperor [Michael VIII], and does not deserve to live" and ordered his execution. Ivaylo, along with Kasim beg, were duly murdered on the spot. Ivan Asen III was fortunate to avoid similar fate due to the advocacy of Euphrosyne and eventually returned to his estates in Asia Minor, where he died in 1303.