The temple of Apollo was constructed at Fana, this calm cove with blue-green waters. The temple was an important and diachronic place of worship for the island, which began its activity in the 9th c. B.C. and well into the Archaic period. The foundations of the temple of Apollo Phanaios are visible today next to the chapel of Agioi Theodoroi, which was built at the exact same location. Here, Leto learned that she would give birth to Apollo on the island of Delos. This is why the temple was dedicated to Apollo Phanaios and it is considered as the Delion of Chios. During the Early Byzantine period, the sanctuary was turned into a Christian church. Materials from the ancient temple were used in the subsequent Christian churches, which were built on its ruins, just like the chapel of Agioi Theodoroi, that one can visit even today.