Saboda yaƙe-yaƙe masu tsada da rashin nasara, hare-haren Mongol da aka maimaita, da rashin kwanciyar hankali, gwamnati ta fuskanci tawaye a shekara ta 1277. Tashin Ivaylo tawaye ne na ƙauyen Bulgeriya don adawa da mulkin Sarki Constantine Tikh da bai dace ba na Bulgeriya.Tashin hankalin dai ya samo asali ne sakamakon gazawar da hukumomin tsakiya suka yi na fuskantar barazanar Mongol a arewa maso gabashin Bulgaria .Mongols sun kwashe shekaru da yawa suna wawashe dukiyar al'ummar Bulgeriya, musamman a yankin Dobrudzha.Rashin rauni na cibiyoyin gwamnati ya kasance saboda haɓaka feudalisation na daular Bulgaria ta biyu.Shugaban manoman Ivaylo, wanda aka ce marubutan Rumawa na zamanin da shi makiyayin aladu ne, ya tabbatar da cewa shi ne babban shugaba mai nasara kuma mai kwarjini.A farkon watanni na tawayen, ya ci Mongols da sojojin sarki, ya kashe Constantine Tikh da kansa a yakin.Daga baya, ya yi nasara a babban birnin Tarnovo, ya auri Maria Palaiologina Kantakouzene, gwauruwar sarki, kuma ya tilasta wa masu mulki su amince da shi a matsayin sarkin Bulgaria.