This is a small but very important monastery, located in the Ano polis of Thessaloniki and called ‘Osios David’ or ‘Monastery Latomou’.  The history of the monastery goes back in the late 5^th or early 6^th century, when a chapel and the tessellation of the niche were built by the privy purse of a woman, who according to tradition was the daughter of the emperor Maximian Galerius.  In the early 9^th century, the monastery operated as the main church of Monastery Latomou, which was named after the quarries (“latomio” in Greek) of the area. During the 16^th century, it was turned into a mosque, while during the previous century it was falsely named as Osios David. Beyond its impressive architecture, which is considered to be a precursor of the cross shaped type with a dome, it features the great tessellation that depicts Ezekiel’s vision and murals dated from the 12^th, 13^th and 14^th century, all great representative specimens of the Byzantine art  in Thessaloniki.  The history and unique architecture of the monastery contributed to its declaration as a UNESCO World Heritage Site.