Ashot IV (Armenian: Աշոտ Դ, romanized: Ashot D, died c. 1040–41), surnamed Kaj (Armenian: Աշոտ Քաջ), i.e. "the Brave, the Valiant", was the younger son of King Gagik I of Armenia.
So he organized a military campaign through his supporters besieging and later conquering the Armenian capital Ani, usurping the power and dethroning the king Hovhannes-Smbat in 1021.
But later on a compromise agreement was reached between the two feuding brothers such the legal heir would reassume his power but on a much smaller territory in provinces near the capital, whereas Ashot would become king in provinces closer to Persia and Georgia.
However, despite the compromise agreement, the feud, sometimes military, continued between the two brothers during their concurrent reign thus greatly weakening the unity of the Bagratuni dynasty.
His son, Gagik II, would later assume the throne and become the last king of Bagratuni lineage to hold the crown of the Armenian kingdom.