On the day after Pentecost, Monday, the Church celebrates the Holy Spirit, the third person of the Holy Trinity and the Holy Trinity in general. On the day of the Holy Spirit, the churches called the Holy Trinity are celebrated and those who bear the names Trinity and Triad celebrate.
Today the picturesque chapel of Agia Triada, in Vrontou, Pieria, celebrates. The church is the remains of the Byzantine monastery of the same name from the 14th century. Its presence makes up an extremely beautiful and one of the most characteristic images of Mount Olympus. On the day of the Holy Spirit, it attracts a large number of visitors and pilgrims, while in the wider area many people rush to picnic and enjoy nature.