Santillana del Mar Collegiate Church has its origins in a monastery dating from 870. Tradition has it that it was home to the relics of Santa Juliana.
Over the course of the 11th century it was transformed into a collegiate church, although the building visible today dates from the 12th century. It has three naves, with dome, transept, three semi-circular apses and a tower. The transept and apses conserve their original barrel-vaulted ceilings. Special mention should be made of the sculptural decoration of the doorway, the capitals and the cloister. Inside you can see medieval tombs and Romanesque reliefs from the 11th and 12th centuries. The main altar has an embossed silver front dating from the 17th century. Beneath this is another, in Romanesque style. The altarpiece is the work of a master artist from Burgos, dating from the beginning of the 16th century. A late-Gothic predelle was subsequently added, along with the Baroque statue of Santa Juliana between two Solomonic columns. On the main doorway there is a Byzantine pantocrator and an atrium flanked by two lions.References:
The Basilica of Santa Maria in Trastevere is one of the oldest churches of Rome. The basic floor plan and wall structure of the church date back to the 340s, and much of the structure to 1140-43. The first sanctuary was built in 221 and 227 by Pope Callixtus I and later completed by Pope Julius I.
The inscription on the episcopal throne states that this is the first church in Rome dedicated to Mary, mother of Jesus, although some claim that privilege belongs to the Basilica di Santa Maria Maggiore. A Christian house-church was founded here about 220 by Pope Saint Callixtus I (217-222) on the site of the Taberna meritoria, a refuge for retired soldiers. The area was made available for Christian use by Emperor Alexander Severus when he settled a dispute between the Christians and tavern-keepers.
The church underwent two restorations in the fifth and eighth centuries and in 1140-43 it was re-erected on its old foundations under Pope Innocent II.