The church of St Mary of the Carmelites is situated in the north west corner of Famagusta. In the 13th century, as the Muslim armies gradually reclaimed the Holy Land, many middle eastern Christians fled to Famagusta. Although Christian, their specific beliefs differed from that of Latin or Orthodox Christians. Because of this, they tended to congregate in the same area, and here you will find churches of the Nestorians, Jacobites and Armenians, as well as the Carmelites.
Because the Carmelites originated from the Carmel mountains of Syria, this area became known as the Syrian quarter of the city. St Mary of the Carmelites, was built in the 14th century as the church of a monastery. It has a single nave of four bays and a three-sided apse. In the second bay, two small chapels were added. The roof had ribbed vaults, and the exterior walls were supported by buttresses.
In its day, it was an important church. The tomb of Peter Thomas, who was the Pope's representative and the Patriarch of Constantinople, who died in 1366 was in this church.
The walls of the church were covered in frescoes, and some of those are still (just) visible. Outside the west door, you can also see the remains of sculptures above the entrance.
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.