Santander's cathedral is composed of two Gothic churches, one above the other. The 14th-century upper church , off which is a 15th-century cloister, was extensively rebuilt after a 1941 fire. In the lower, 13th-century Iglesia del Santísimo Cristo , glass floors reveal excavated bits of Roman Santander. Displayed nearby are silver vessels containing the skulls of the early Christian martyrs San Emeterio and San Celedonio, Santander's patron saints.
