Ephraim from Ainos wrote a chronicle (Chronikē Istoria), in the twelve-syllable verse, which covered the history of the Old and New Rome from the 1st century A.D. to 1261, i.e. the period covering twelve centuries. While writing this chronicle, he predominantly relied on the world chronicle by John Zonaras and the historical works by Niketas Choniates and George Akropolites. In regard to Serbian 13th century history, it should be pointed out that Ephraim mentioned three pieces of information. Chronologically speaking, the two of them, the first and the third, are well known from other sources as well. The first one was the information that Eudokia, daughter of the Byzantine emperor Alexios III Angelos, had been married to Stefan, son of Nemanja, and the third one was about the well-known and well-documented event, the Serbian invasion into the European territories of the Empire of Nicaea, in the vicinity of towns Kičevo and Prilep, in 1257. The second news in order, and controversial to certain degree, spoke about the alleged occupation of the part of Serbian territories by the ruler of Epiros Theodore I Angelos during the first years of his rule. The contemporary historian George Akropolites, who was much closer to these events, did not list the Serbian territories among those conquered by the ruler of Epiros.
