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In the thirteenth century, Thomas Aquinas was one of the dominant Scholastic theologians. He dealt explicitly with the processions of the divine Persons in his ''Summa Theologica''. While the theology of Aquinas and other Scholastics was dominant in the Western Middle Ages, for all its apparent clarity and brilliance, it remains theology, not official [[Roman Catholic Church]] teaching.
In 1274, the Second [[Council of Lyons]] said that the [[Holy Spirit]] proceeds from the [[God the Father|Father]] and the [[Christ|Son]], in accord with the ''filioque'' in the contemporary Latin version of the [[Nicene Creed]]. Reconciliation with the East, through this council, did not last. Remembering the Crusaders' sack of Constantinople in 1204, Orthodox Christians did not want to be reconciled with the West in terms of capitulation to Latin [[Triadology]] and [[ecclesiology]]. In 1283, Patriarch [[John XI Bekkos of Constantinople|John Beccus]], who supported reconciliation with the Latin Church, was forced to abdicate; reunion failed.
The Crusaders in question were the Venetians of the [[Fourth Crusade]], who had earlier been excommunicated for attacking other Christians. In 1204, they were getting even for a slaughter of Venetian merchants, in rioting, that took place in 1182. Pope Innocent III had sent them a letter, asking them not to attack Constantinople; after hearing of the sack of the city, he lamented their action and disowned them. Nevertheless, the people of Constantinople had a deep hatred for the people they called the "Latins" or the "Franks," and of course the Western church's major "endowment" from the spoils carried away now still largely rests in the hands of the Vatican.