The Georgian coins are an important primary source for the history of Georgia and neighboring countries. Georgian coins minted from the 10th to 12th centuries are known as "Georgian-Byzantine coins". The Georgian rulers are mentioned not only with their official Georgian titles, but their Byzantine titles appear as well. Davit III, Bagrat IV, Giorgi II are mentioned with their Byzantine court titles while Davit IV the Restorer is described with his Byzantine court title on his early coin issues, but on his later copper coins he appears in the imperial coat similar to the Byzantine rulers. Narrative sources confirm imperial connections of Davit IV starting from 1103. He was styled "Emperor of the Entire East" and "Autocrat", thus declaring himself ruler of the eastern Christian World, while in Georgian sources the Byzantine Emperor was viewed as the ruler of "The Entire West".