The medieval Georgian Chronicles present an eponymous ancestor of the Kartvelians, Kartlos, a great-grandson of Japheth. However, scholars agree that the word is derived from the "Karts", the latter being one of the proto-Georgian tribes that emerged as a dominant group in ancient times. The name "Sakartvelo" (საქართველო) consists of two parts. Its root, "kartvel-i" (ქართველ-ი), specifies an inhabitant of the core central-eastern Georgian region of Kartli, or Iberia as it is known in sources of the Eastern Roman Empire. Ancient Greeks (Strabo, Herodotus, Plutarch, Homer, etc.) and Romans (Titus Livius, Tacitus, etc.) referred to early western Georgians as Colchians and eastern Georgians as Iberians ("Iberoi" in some Greek sources). The Georgian circumfix "sa"-X-"o" is a standard geographic construction designating "the area where X dwell", where X is an ethnonym. Today the full, official name of the country is "Georgia", as specified in the official English version of the Georgian constitution which reads ""Georgia" shall be the name of the State of Georgia." Before the 1995 constitution came into force the country's name was the "Republic of Georgia". The territory of modern-day Georgia was inhabited by "Homo erectus" since the Paleolithic Era. The proto-Georgian tribes first appear in written history in the 12th century BC. The earliest evidence of wine to date has been found in Georgia, where 8000-year old wine jars were uncovered. Archaeological finds and references in ancient sources also reveal elements of early political and state formations characterized by advanced metallurgy and goldsmith techniques that date back to the 7th century BC and beyond. In fact, early metallurgy started in Georgia during the 6th millennium BC, associated with the Shulaveri-Shomu culture. The classical period saw the rise of a number of early Georgian states, the principal of which was Colchis in the west and Iberia in the east. In Greek mythology, Colchis was the location of the Golden Fleece sought by Jason and the Argonauts in Apollonius Rhodius' epic tale "Argonautica".