Ceratus of Grenoble

Saint Ceratus (also called Ceras or Gerase) was bishop of the city of Gratianopolis, today Grenoble, in Gaul, in the fifth century. He is commemorated on 6 June, mainly in the Catholic Church.

He was bishop between about 441 and 450. During his episcopate he opposed the Arianism of the Burgundians, who had occupied the land, and for this he was driven out of the city. He died around 450 or 452, as the sources vary. The Roman Martyrology places his day of commemoration on 6 June.

According to one source, he was recognised as a saint for the whole Catholic Church by an act of Pope Pius X on 9 December 1903. His relics were preserved at Simorre in the archdiocese of Auch. In the town of Éauze his name is kept in the name of the Rue Saint-⁠Cérat.

He lived before the separation of the Churches, and so he is venerated as a saint of the undivided Church.