Арташес I
After 331 BC, Armenia was divided into Lesser Armenia (a region of the Kingdom of Pontus), the Kingdom of Armenia (corresponding to Armenia Major) and the Kingdom of Sophene. In 189 BC when Artashes I's reign began, many neighboring countries (Media, Caucasian Iberia, Seleucid Empire) exploiting the weakened state of the kingdom, conquered its remote regions. Strabo says that Artaxias I raided to the east and reunited Caspiane and Paytakaran, then raided to the north, defeated the Iberians, reuniting Gugark (Strabo also notes that Iberia recognized themselves as vassals of the Kingdom of Armenia at this time), to the west, reuniting Karin, Ekeghik and Derjan and to the south, where, after many battles with the Seleucid Empire, he reunited Tmorik. Artaxias I was not able to reunite Lesser Armenia, Corduene, and Sophene, something completed by his grandson Tigranes the Great. During Artaxias I's reign the Kingdom of Armenia covered . At its peak, under Tigranes the Great, it covered , incorporating, besides Armenia Major, Iberia, Albania, Cappadocia, Cilicia, Armenian Mesopotamia, Osroene, Adiabene, Syria, Assyria, Commagene, Sophene, Judea and Atropatene. Parthia and also some Arab tribes were vassals of Tigranes the Great. Lesser Armenia's area was .