The Byzantine historian George Akropolites claimed that after the death of Kaloyan, his sister's son Boril 'married his Scythian aunt'.
When Baldwin rejected her, she complained to Kaloyan, claiming that the captive Emperor had tried to convince her to help him run away, proposing to wed and crown her.
Another reason for the historians' distrust of the story is the time of its arising: almost forty years after the events took place, and it was spread in France, not Bulgaria.
As Ignatov points out, Alberih himself started the story by elaborating that he did not deliver confirmed data, so it might be just a rumour without any proof and still more, backed up by no logic, since the Bulgarian Tsaritsa wore the crown of a prospering state, she was wife to the victor over Byzantines, Latins, Serbians, and Hungarians, while Baldwin I was defeated, imprisoned, humiliated.
[5] After Kaloyan's death in 1207, she married his nephew and successor Boril of Bulgaria and that fact, combined with the probable Cuman identity of Kaloyan's supposed murderer, Manastur, encouraged many historians, especially those from the end of 19th and the first half of 20th century, to believe that together with Boril, she was part of a conspiracy that took her husband's life.
Despite the differences in their beliefs about the reasons for Kaloyan's death - a conspiracy of Byzantines and Latins, death by natural reasons - Ivan Duichev, Ivan Bogilov, Genoveva Tzancova-Petkova, and Veselin Ignatov all support the idea that Boril's marriage with the Dowager Tsaritsa was only a way to legalize his coming to the throne.