The period following this time of prosperity was one of incessant warfare as Iberia was forced to defend against numerous invasions into its territories. Some southern parts of Iberia, that were conquered from the Kingdom of Armenia, in the 2nd century BC were reunited to Armenia and the Colchian lands seceded to form separate princedoms ("sceptuchoi"). At the end of the 2nd century BC, the Pharnavazid king Pharnajom was dethroned by his own subjects and the crown given to the Armenian prince Artaxias who ascended the Iberian throne in 93 BC, establishing the Artaxiad dynasty of Iberia.