Diocletian was Roman emperor from 284 to 305 when he retired to his palace in Split. The palace is an almost perfectly shaped rectangular surrounded by walls and towers. There are two main roman streets within the palace that stand out running north - south and eastwest and both of them on each side end with doors. Next to the street intersection in the center is the Peristyle. Three temples were located on the western side of Peristyle and on the eastern side of the Peristyle was an emperor's mausoleum. On the southern side of Peristyle, the upper part over a circular Vestibule leads to Diocletian's living space and finally the emperor's promenade along the south wall. Also, on the southern side of the Peristyle substructure leads to the southern door with sea access. Northern rooms/areas of the palace are poorly researched. The assumption is that there were rooms for the army, servants, slaves, storage and similar. The second assumption is by Joško Belamarić who places gynaeceum in the northern part of the palace.