Saints Emeterius and Celedonius are venerated as saints by the Catholic Church. Two Roman legionaries, they were martyred for their faith around 300. They are patron saints of Calahorra, which is traditionally regarded as the place of their death.

The Cathedral of Santa María is a cathedral located in Calahorra. It is one of the cathedrals belonging to the Roman Catholic Diocese of Calahorra y La Calzada-Logroño.