This state reached the apex of its strength and prestige under the queen Tamar (1184–1213). On one occasion, a contemporary Georgian chronicler mentions a people called "Apsars". This source explains the sobriquet 'Lasha' of Tamar's son and successor George IV as meaning "enlightenment" in the language of the Apsars. Some modern linguists link this nickname to the modern Abkhaz words "a-lasha" for "clear" and "a-lashara" for "light", identifying the Apsars with the possible ancestors of the modern-day Abkhaz, though the exact identity and location of this tribe is unclear.