In the earlier years of Assen's reign, Wallacho-Bulgaria was nominally in communion with Rome, and his daughter was engaged to marry the Latin Emperor of the East, Baldwin II. When Pope Gregory IX pressured Baldwin into breaking off the engagement and courting a princess of more immediate interest to the papacy, Assen announced the dissolution of the Unia and the return of Orthodoxy. Gregory's response was to call for a Crusade against the Balkan heretics, but the projected war never went forward --- the Mongols invaded Europe, and all other quarrels temporarily faded into insignificance.
Norman Hugh Redington
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