There have been a number of synods held at Troyes:
Council of 867
The council was held on orders of Pope Nicholas I, to deal with Hincmar of Reims and his quarrels.[1] The decrees were signed on 2 November 867.[2] The Council ruled that no bishop could be deposed from his See without the consent of the Pope.[3]
Pope John VIII proclaimed that no bishop could be deposed without reference to the Holy See
Bishops present
John, Bishop of Rome
Walbertus, Bishop of Porto
Petrus, Bishop of Forum Sempronii (Fossombrone)
Pascasius, Bishop
Hincmar, Archbishop of Reims
Ansegisus, Archbishop of Sens
Aurelianus, Archbishop of Lyon
Sigebodus, Archbishop of Narbonne
Rostagnus, Archbishop of Arles
Adalardus, Archbishop of Tours
Teudericus Archbishop of Besançon
Ottramnus, Archbishop of Vienne
Isaac, Bishop of Langres
Gerboldus, Bishop of Châlons-sur-Saône
Agilmarus, Bishop of Clermont (Arvernensis)
Bernerus, Bishop of Grenoble
Abbo, Bishop of Nevers
Ottulfus, Bishop of Tréguier
Gislebertus, Bishop of Chartres
Walefridus, Bishop of Uzés
Hildebaldus, Bishop of Soissons
Teutherus, Bishop of Gerona
Ingelwinus, Bishop of Paris
Edenulfus, Bishop of Laon
Adebertus, Bishop of Senlis
Berno, Bishop of Chalons
Maricus, Bishop of Béziers
Ecfridus, Bishop of Poitiers
Abbo, Bishop of Maguelonne
Frodoinus, Bishop of Barcelona
Arnaldus, Bishop of Toul
Council of 1078
Summoned By Archbishop Hugues de Die and the Abbot of Cluny.[5]
Council of 1104
Convened by Cardinal Richard, Bishop of Albano, Papal Legate[6]
Council of 1107
Convened on 23 May 1107 by Pope Paschal II personally. Rothard, Bishop of Mainz, was suspended from office because he had dared to reconcile a schismatic bishop, Udo of Hildesheim, to the Church.[7]
Bishops attending
No complete list survives. Some bishops who probably attended can be discovered in surviving documents: