113 Particularly significant was the initiative taken by Saint John Eudes, who, “after preaching with his confrères a fervent mission in Rennes, convinced the bishop of that diocese to approve the celebration of the feast of the Adorable Heart of our Lord Jesus Christ. This was the first time that such a feast was officially authorized in the Church. Following this, between the years 1670 and 1671, the bishops of Coutances, Evreux, Bayeux, Lisieux and Rouen authorized the celebration of the feast for their respective dioceses”.
Source: Dilexit Nos (Vatican.va)