The Björlanda Church is a medieval church built in the 13th and 14th centuries. It was inaugurated, according to the Icelandic skald Eysteinn Ásgrímsson, on a 15 July; the year of the inauguration is not known. The building has been renovated and extended numerous times. Additional windows were installed in the 17th century. In 1734, the medieval choir was torn down. The renovation works of 1936 resulted in the discovery of medieval murals. The church is surrounded by a churchyard, the first records of which come from the 18th century.
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.