The Lazic War, also known as the Colchidian War or in Georgian historiography as the Great War of Egrisi, was fought between the Byzantine Empire and the Sasanian Empire for control of the ancient Georgian region of Lazica. The Lazic War lasted for twenty years, from 541 to 562, and ended with the Fifty-Year Peace Treaty, which obligated the Byzantine Empire to pay tribute to Persia each year for the recognition of Lazica as a Byzantine vassal state by Persians. The Lazic War is narrated in detail in the works of Procopius and Agathias.