The Alahan Monastery Located in the mountains of Isauria in Mersin province, the Alahan Monastery is a complex of fifth-century buildings that played a significant role in early Byzantine architecture. Although it was originally called a monastery, recent scholarship has contested this attribution and instead considers it to be a pilgrimage shrine. Construction at this site occurred in two distinct periods. The first took place in the mid-fifth century under the rule of Emperor Leo I, while the second occurred in the last quarter of that century under Emperor Zeno. The complex consists of three churches, chambers, a baptistery for ritual washing before baptism, living quarters, and many other spaces, including a forecourt and lower terrace. Although there is debate about the original purpose of the Alahan Monastery, it became a communal living space for monks and pilgrims until the seventh century. Emperor Zeno, who hailed from Isauria*, took over the construction work on the project around 500 AD when he assumed power and may have funded it himself. He often returned to his homeland for retreat, which suggests that he had a personal interest in completing the project. The ruins of Alahan are an excellent example of the Isaurian style in stonemasonry, which was popular during the era before 500 AD. The region is also known as a significant ancient site in Byzantine architecture. The Alahan Monastery boasts of three churches and a unique twin-apsed baptistery. One of the churches is located in a naturally formed cave which used to have several rooms but now stands empty, except for the single church inside. It is believed to be the first church built in the monastery. The largest church in the complex is the West Church, also known as the "Church of the Evangelists". Its basilica form has three rows, a central nave and two side aisles, and measures 36 by 16 meters. Although less preserved than the other churches, it was identified as a service entrance for visitors before being recognized for its religious purposes. The best-preserved of the churches is the East Church, which is considerably smaller, measuring 23 by 15 meters, and has only a basilica design. It features a pillar-like tower made of light timber tiles on its eastern region. This church has minimal adornments on its facade as it was only approached from within the monastery. The Alahan Monastery is also home to a rare twin-apsed baptistery that was added as the community’s population expanded. The original Alahan cave church contained a crucifix-shaped pool that likely served as its first baptismal font. The Alahan Monastery is significant in Byzantine architecture and was added to the Tentative List of UNESCO in 2000.