The ruins of the so-called Limenos Basilica, a Christian church dating
from the 5th century, standing in the Kos Agora.
It was a three-naved basilica with a wooden roof, and an atrium and baptistery. With the length of 72 metres and width of 23 metres it was one of the biggest basilicas in the Mediterranean at the time it was built. Most likely the church was the first building of the new religion in Kos.
The Basilica was erected on the remnants of the Limenos Arcade and the embakment of the eastern harbour, with the extensive use of the building materials coming from the numerous ancient structures standing around the Agora. Ironically, one thousand years later, the basilica itself served as a source of the building material during the extension of the Neratiza Castle by the Knights Hospitaller.