Kalojan

...The Byzantines marched to Tarnovo to fight back against them from the end of 86 to the beginning of the following year, but were held back by Lovech in central northern Bulgaria. After three months of fighting, a peace treaty was concluded, and in 87 the Second Bulgarian Empire (capital Tarnovo) was officially established with Asen as emperor. The youngest brother of the Asen family, Emperor Kalojan (reigned 1197-1207), took advantage of the sack of Constantinople by the Fourth Crusade and the disintegration of the Byzantine Empire to expand his power southward. During the reign of Ivan Asen II (reigned 1218-41), the Second Bulgarian Empire reached its zenith, and regained its former high culture and national power. ...

*Some of the terminology explanations that mention "Kalojan" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…ビザンティン側は86年末から翌年初頭，これを迎え討つためにタルノボに向かったが，北ブルガリア中央部のロベチに押し止められ，3ヵ月の攻防戦の後に講和が結ばれ，87年，アセンを皇帝とする第2次ブルガリア帝国(首都はタルノボ)が正式に成立した。　アセン一族の末弟カロヤンKalojan帝(在位1197‐1207)は，第4回十字軍によるコンスタンティノポリスの略奪とビザンティン帝国の解体に乗じて南に勢力を広げた。イバン･アセン2世Ivan Asen II(在位1218‐41)の時代に，第2次ブルガリア帝国は最盛期を迎え，かつての高い文化と国力を取り戻すにいたった。…

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