In Greco-Roman geography, Iberia (Ancient Greek: Iberia; ) was an exonym for the Georgian kingdom of Kartli (), known after its core province, which during Classical Antiquity and the Early Middle Ages was a significant monarchy in the Caucasus, either as an independent state or as a dependent of larger empires, notably the Sassanid and Roman empires. Iberia, centered on present-day Eastern Georgia, was bordered by Colchis in the west, Caucasian Albania in the east and Armenia in the south. Its population, the Iberians, formed the nucleus of the Kartvelians (i.e. Georgians). Iberia, ruled by the Pharnavazid, Artaxiad, Arsacid and Chosroid royal dynasties, together with Colchis to its west, would form the nucleus of the unified medieval Kingdom of Georgia under the Bagrationi dynasty. In the 4th century, after the Christianization of Iberia by Saint Nino during the reign of King Mirian III, Christianity was made the state religion of the kingdom. Starting in the early 6th century AD, the kingdom's position as a Sassanian vassal state was changed into direct Persian rule. In 580, king Hormizd IV (578-590) abolished the monarchy after the death of King Bakur III, and Iberia became a Persian province ruled by a marzpan (governor). The term "Caucasian Iberia" is also used to distinguish it from the Iberian Peninsula in Southwestern Europe. Name The provenance of the name "Iberia" is unclear. One theory on the etymology of the name Iberia, proposed by Giorgi Melikishvili, was that it was derived from the contemporary Armenian designation for Georgia, Virkʿ (, and Ivirkʿ [Իվիրք] and Iverkʿ [Իվերք]), which itself was connected to the word Sver (or Svir), the Kartvelian designation for Georgians. The letter "s" in this instance served as a prefix for the root word "Ver" (or "Vir"). Accordingly, in following Ivane Javakhishvili's theory, the ethnic designation of "Sber", a variant of Sver, was derived from the word "Hber" ("Hver") (and thus Iberia) and the Armenian variants, Veria and Viria. Historian argues that the name Iberian was given by Ancient Greeks to two different peoples located at the extremities of their world (in the Iberian Peninsula and the Caucasus) due to the mythical wealth associated with them (Tartessos and the Golden Fleece of Colchis). History Early history In earliest times, the area of Caucasian Iberia was inhabited by several related tribes stemming from the Kura-Araxes culture. The Saspers (who were mentioned by Herodotus), may have played a