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In return, the Nicaean patriarch was recognized by Asen as ecumenical and he gave up his claims over Mount Athos , along with ecclesiastical authority in the areas of eastern Thrace and Thessaloniki . [ 11 ] The alliance was sealed with the marriage between Asen's daughter, Elena , and the Nicean heir, Theodore . The joint campaign started in the summer of the same year after the marriage. [ 12 ] [ 13 ] Siege [ edit ] Schematic of the Theodosian walls, showing the three...