Saints Emeterius (or Hemeterius, Madir[1]) and Celedonius (Spanish: San Emeterio y San Celedonio; Latin: Emeterius et Caeledonius; died c. 300 AD) are venerated as saints by the Catholic Church.

They are patron saints of Calahorra (La Rioja), which is traditionally regarded as the place of their death.

[2] It may have been during either the persecutions of Diocletian or of Valerian when they were imprisoned and forced to decide between renouncing the faith or leaving the army.

According to Prudentius, the brothers Emeterius and Celedonius, soldiers of the Legio VII Gemina, were martyred at Calahorra, but the exact date of their martyrdom is unknown.

[3] In the fourth century pilgrims from distant lands came to pray at the tomb of these saints, whose relics are still preserved in Calahorra Cathedral.