St John the Baptist Church is a Grade I listed parish church, the only church dating to pre-Medieval times in Cardiff city centre. The church was built in 1180 as a chapel of ease for the larger St Mary's Church, itself founded by Benedictine monks from Tewkesbury Abbey. Originally constructed of blue Lias, a Jurassic stone with layers of fossilised shells, it was sourced from Aberthaw. The walls were then originally dressed with freestone - limestone sourced from Dundry.
St John's was sacked during a rebellion of Owain Glyndŵr in 1404. The church was rebuilt in the second half of the 15th Century and given a perpendicular tower with a peal of ten bells. Today it still has a crown of openwork battlements, reminiscent of churches in the West Country of England, and is dated c.1490 because of the similar Jasper Tower of Llandaff Cathedral which was built at this time.
After the foundations of St Mary's were destroyed by the Bristol Channel flood of 1607, the two churches were worked as a dual-location parish until all main services were moved to St John in 1620.
In 1843, John Crichton-Stuart, 2nd Marquess of Bute paid for the construction of the Church of St. Mary the Virgin and St. Stephen the Martyr in Bute Street as a permanent replacement for St Mary's. This allowed the reconstruction of St John, with extensions to the church made in 1886–1897 using carboniferous limestone quarried from Culverhouse Cross. The churchyard wall was also rebuilt, using original Lias mixed with red sandstone in the walls, topped with coping stones of Devonian sandstones from the Forest of Dean.
In 1851 the Cardiff firm of Messrs. Thomas & Norris were engaged for repewing of St John's with the work to be completed by Christmas that year.
St John's stained glass windows date from circa 1855, in the north chapel, with references to the Bute family. Those in the north inner aisle date to 1869, by Morris & Co, with a top row of apostles designed by William Morris himself.
The church was increased in width with outer aisles added to St John's in 1889 and 1891. The old aisle windows were re-set and all the new building was re-surfaced with Sweldon limestone.
The graveyard, already full, was divided by a new public pathway in the 1890s connecting Working Street with Cardiff Central Market. As part of the agreement for the new path, Cardiff Corporation agreed to take responsibility for the graveyard south of the path. This later became St John's Gardens. The path is still owned by the church and is closed every Good Friday. Brass numbers on the path mark the location of graves and family tombs.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.