Pharnavaz I was the first king of Kartli

Kartli

Kartli is a historical region in central-to-eastern Georgia traversed by the river Mtkvari , on which Georgia's capital, Tbilisi, is situated. Known to the Classical authors as Iberia, Kartli played a crucial role in ethnic and political consolidation of the Georgians in the Middle Ages...

, an ancient Georgian

Georgia (country)

Georgia is a sovereign state in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded to the west by the Black Sea, to the north by Russia, to the southwest by Turkey, to the south by Armenia, and to the southeast by Azerbaijan. The capital of...

 kingdom known as Iberia

Caucasian Iberia

Iberia , also known as Iveria , was a name given by the ancient Greeks and Romans to the ancient Georgian kingdom of Kartli , corresponding roughly to the eastern and southern parts of the present day Georgia...

 to the Classical

Classical antiquity

Classical antiquity is a broad term for a long period of cultural history centered on the Mediterranean Sea, comprising the interlocking civilizations of ancient Greece and ancient Rome, collectively known as the Greco-Roman world...

 sources, who is credited by the medieval Georgian written tradition with founding the kingship of Kartli and the Parnavaziani dynasty

Pharnabazid Dynasty

The Pharnabazid or P’arnavaziani is the name of the first dynasty of Georgian kings of Kartli preserved by the Georgian historical tradition. Their rule lasted, with intermissions, from the 3rd century BC to the 2nd century AD. The main male line is reported to have become extinct early on and...

. He is not directly attested in non-Georgian sources and there is not definite contemporary indication that he was indeed the first of the Georgian kings.