Key term for OCR GCSE History B, used in Jerusalem July 1098 to July 1100.
The ruler of the Eastern Roman Empire to whom the Crusaders had sworn an oath to return formerly Byzantine lands.
Byzantine Emperor Alexios I appears in OCR GCSE History B revision content for The First Crusade (c.1070–1100), especially Jerusalem July 1098 to July 1100 and Journey to Jerusalem.
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