The new Kingdom didn't stay united for long, however, due to internal conflicts, civil wars, and external pressures, Armenia often found itself fragmented between other noble Armenian houses, most notably the Mamikonian and Siunia families, the latter of which would produce a cadet branch known as the House of Khachen, named after their stronghold in Artsakh. The House of Khachen ruled the Kingdom of Artsakh in the 11th century as an independent kingdom under the protectorate of the Bagratid Kingdom of Armenia. Under the House of Khachen, the region historically called Artsakh became synonymous with the name "Khachen".