Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Ancient City of Tauric Chersonese and its Chora' has mentioned 'Fourth Crusade' in the following places:
Occurrence Sentence Text Source
After the Fourth Crusade (1202xe2x80x9304), Chersonesus became dependent on the Byzantine Empire of Trebizond as the Principality of Theodoro.