Dizak
Dizak, also known as Ktish after its main stronghold, was a medieval Armenian principality in the historical Artsakh and later one of the five melikdoms of Karabakh, which included the southern third of Khachen and from the 13th century also the canton of Baghk of Syunik. The founder of this principality was Esayi abu-Muse, in the 9th century. In the 16-18th centuries Dizak was ruled by the Armenian Melik-Avanian dynasty, a branch of the House of Syunik-Khachen. The seat of the princes of Dizak was the town of Togh with the adjacent ancient fortress of Ktish. One of the last princes of Dizak, Esayi Melik-Avanian, was killed by Ibrahim Khalil Khan in 1781, after a long-lasting resistance in the fortress of Ktish.
Today the name "Dizak" is often used to refer to the province Hadrut of Nagorno-Karabakh Republic.