This is one of the few buildings in round shape of the roman arquitecture. Built in Thessaloniki, a capital city of the roman empire for that period. Dated of the beginings of the 4th century after Christ. it has been used initially as a roman mausoleum, then as a christian ortodox church, after as a muslin mosquee and then again an ortodox church, in 1912, and recently, after 1978, as a museum.