Roman fortifications in Georgia (country)

ancient city in Lazica (modern Georgia)

Losorion or Lysiris (), was a Byzantine (Roman) fortification on the eastern Black Sea coast, in Lazica in what is now Batumi, western Georgia. In the 6th century, it was constructed by Byzantine emperor Justinian I, and due to its strategic location became a battleground of the 541–562 Lazic War between Rome and Sasanian Persia (Iran). It was identified with the Medieval fortress of Batumi, known as Tamaris Tsikhe, i.e. Queen Tamar's Castle.