It was re-established in 1802 as a suffragan of the Archbishopric of Paris, when it comprised the départements of Aube and Yonne and its bishop had the titles of Troyes, Auxerre, and Châlons-sur-Marne.

During his term, Bishop Ottulph (870-883) began to rebuild the cathedral, which had fallen in ruins due to neglect; coincidentally, he discovered the body of Saint Frobert, which became an object of veneration.

In 878, he was host to Pope John VIII who had abandoned Italy, fleeing from the violence of Lambert, Duke of Spoleto.

[10] The ancient collegiate Church of St. Urbain[11] is a Gothic building whose lightness of treatment is reminiscent of La Sainte-Chapelle at Paris.

Clement VI, persuaded by interested parties, issued four Bulls on 30 January 1354, approving the exposition as lawful, and two more, on 3 August 1354 (granting indulgences) and 5 June 1357.

[15] In 1418 during the civil wars, the Canons entrusted the Winding Sheet to Humbert, Count de La Roche, Lord of Lirey.

[19] The legitimate bishop, Louis-Mathias-Joseph de Barral, refused to take the oath, departed Troyes on 11 March 1791, and emigrated to Switzerland by way of Trier.

[21] The diocesan seminary did not have enough teachers or students to continue to function; the building was used as a detention center for suspicious persons.

[22] In Switzerland, Bishop de Barral conferred with a number of his fellow exiles from the episcopal college, who came to the opinion that one might swear the Constitutional oath.

After Napoleon came to power on 18 Brumaire 1799, de Barral wrote to the priests of his diocese that it was acceptable to take the oath to the Consulate.

[23] As for those left behind, on 20 March 1791 the electors of 'Aube' met and elected as their bishop Augustin Sibille, who had been curé of the parish of Saint-Pantaleon in Troyes for thirty years.

[29] The locals of Clairvaux, according to the official story, preserved the remains, and Bishop Emmanuel-Jules Ravinet had those gathered up in 1875 and brought to the Cathedral in Troyes, where they are still kept.

The Benedictine Mabillon undertook to interpret its carvings, among which might be seen the statue of a reine pédauque (i.e. a web-footed queen) supposed to be St. Clotilde.

The Jansenists in the 18th century made a great noise over the pretended cure by the deacon François Paris of Marie Madeleine de Mégrigny,[35] a nun of Notre Dame aux Nonnains.

[36] In it the Abbess Heloise died in 1163; her body was interred there, and the remains of Abelard were buried there as well, until ejected by fanatics of the Revolution in 1792.

Before the application of the Associations Law (1901), which instituted the separation between church and state in France, there were, in the Diocese of Troyes, Benedictines, Jesuits, Lazarists, Oblates of St. Francis of Sales, and Brothers of the Christian Schools.

Many female congregations arose in the diocese, among others the Ursulines of Christian Teaching, founded at Moissy l'Evêque in the eighteenth century by Gilbert Gaspard de Montmorin, Bishop of Langres; the Sisters of Christian Instruction, founded in 1819, with motherhouse at Troyes; the Oblate Sisters of St. Francis de Sales, a teaching order, founded in 1866, with motherhouse at Troyes; Sisters of Notre Dame de Bon Secours, a nursing community with motherhouse at Troyes.