If I remember correctly, only Partzerpert (therefore Sis, as Partzerpert was the Stronghold overlooking Sis) was under Armenian rule, after Mleh's reign ended. (to gain support of the Mamelukes, he converted to Islam, but he was overthrown and exiled in 1075 by Roupen II, who will start the game as Arkah)
Many Armenian rebelled against his rule and he lost large amounts of land.