in 451 the new regime with Marcian as emperor called a council to a city where the imperial troops could keep an eye on what was going on: Chalcedon, near Constantinople. The main concern at Chalcedon was to persuade as many people as possible to accept a middle-of-the-road settlement. The council accepted as orthodoxy the ‘Tome’ presented to Ephesus by Pope Leo’s envoys two years before, and it constructed a carefully balanced definition of how to view the mystery of Christ: ‘the same perfect in divinity and perfect in humanity, the same truly God and truly man, of a rational soul and a body;
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