Some articles on kaloyan:

Kaloyan (sebastocrator)
... Kaloyan (Bulgarian Калоян Old Bulgarian ) was a 13th-century Bulgarian noble, sebastocrator of Sredets (Sofia) and the surrounding region during the Asen dynasty of the Second Bulgarian Empire ... Kaloyan may have been the grandson of Tsar Ivan Asen I (1189–1196) from his younger son sebastocrator Alexander, as he is mentioned as a cousin of Tsar Constantine Tih (12 ... Kaloyan was an opponent of Tsar Michael Asen I's (1246–1256) pro-Byzantine policy and took part in the plot against him ...