A monastery of great importance since it is the only byzantine monastery in the city operating until today. According to tradition, it was built at the exact spot where Apostle Paul taught during his stay in Thessaloniki. It was founded in 1351-1371 by the monk Dorotheos Vlatis, student of Gregorius Palamas and subsequently Bishop of Thessaloniki. It currently houses the headquarters of the patriarchal Institute of Paternal Studies of the Ecumenical Patriarchate of Constantinople. Furthermore, the monastery is quite famous for another reason far beyond of any religious aspect, as it offers an exceptional view to the city, as far as Olympus mountain, while the sunset over the Thermaikos Gulf is definitely something to remember.