High Middle Ages

===Southeast Europe===
[[File:Khazarfall1.png|thumb|upright=1.3|The [[Pontic steppe]]s, {{circa|lk=no|1015}}]]
{{Main|Komnenian restoration|Second Bulgarian Empire|Serbian Grand Principality|Principality of Arbanon|Banate of Bosnia|Croatia in the union with Hungary}}

The High Middle Ages saw the height and decline of the Slavic state of [[Kievan Rus']] and emergence of [[Cumania]]. Later, the [[Mongol invasions|Mongol invasion]] in the 13th century had great impact on the east of [[Europe]], as many countries of the region were invaded, pillaged, conquered and/or vassalized.

During the first half of this period ({{circa|lk=no|1025}}{{mdash}}1185) the [[Byzantine Empire]] dominated the [[Southeast Europe]], and under the [[Byzantine Empire under the Komnenos dynasty|Komnenian]] emperors there was a revival of prosperity and urbanization; however, their domination of [[Southeast Europe]] came to an end with a successful [[Uprising of Asen and Peter|Vlach-Bulgarian rebellion in 1185]], and henceforth the region was divided between the Byzantines in Greece, some parts of [[Macedonia (region)|Macedonia]], and [[Thrace]], the Bulgarians in [[Moesia]] and most of Thrace and Macedonia, and the [[Serbian Grand Principality|Serbs]] to the northwest. Eastern and Western churches had formally split in the 11th century, and despite occasional periods of co-operation during the 12th century, in 1204 the [[Fourth Crusade]] treacherously captured [[Constantinople]]. This severely damaged the Byzantines, and their power was ultimately weakened by the [[Seljuq Empire|Seljuks]] and the rising [[Ottoman Empire]] in the 14–15th century. The power of the [[Latin Empire]], however, was short-lived after the Crusader army was routed by [[list of Bulgarian monarchs|Bulgarian Emperor]] [[Kaloyan of Bulgaria|Kaloyan]] in the [[Battle of Adrianople (1205)]].