Ivaylo's successes troubles the Emperor Michael VIII…
1278 CE
Later Michael VIII changes his plan and marries his eldest daughter Eirene to Ivan Asen III, a descendant of Bulgaria's ruling dynasty living at the imperial court, and dispatched troops to place him on the throne.
With imperial armies marching north intent on placing Ivan Asen III on the throne, Maria Kantakouzene comes to an arrangement with Ivaylo, whereby she marries her husband's murderer and associates him on the throne together with her minor son.