Panagia Chliadou is the cathedral of the Old Assumption Monastery. According to tradition it was the thousandth Monastery built by Empress Theodora, hence the name Chiliadou. The temple is cruciform and dates back to the 12th century. Tradition says the empress built it here because she found a safe haven from a seaside disturbance. But it is probably a myth, since when there is a thunderstorm on the beach the pebbles do not "stand" either. The church has beautiful frescoes and a truly elegant iconostasis, which is carved in wood. The roof is supported by four pillars, while the floor is stone. Still, it is worth noticing the relief stone icon of Virgin Mary. It is a very quiet and worthy church for anyone to visit, and on the occasion of the 15th of August, which is considered one of the most important holidays of the year, pilgrims, holidaymakers and celebrants will flood the chapel of Our Lady of Heliadi in order to honor .
