Agia Triada (formerly Steveniko) is a beautiful mountain village built at the foot of Mount Helicon at an altitude of 400 meters. The existence of Roman epigraphs and a Byzantine castle reinforces the view that the area was inhabited in antiquity or in the Medieval period. The settlement is first mentioned in Ottoman documents of 1466 AD under the name of Steveniko and is recorded as a Greek-speaking settlement, in contradiction to the neighbouring villages, which are referred to as Arvanitic villages. During the late Turkish occupation it was the largest settlement in its region and was a point of strategic importance due to its fortification.