Yanis was the leader of a group of mercenaries that he had raised in about 1400 BC in order to disrupt the succession between Egyptian Pharaohs Amenhotep II and Erimem. A cruel leader, he preferred to achieve his troops' obedience through fear than respect, passion or any other cause.
He allied himself with the priest Horemshep, who was using a gestalt entity he had found in a stasis box in order to possess people and effect an alternate line of succession. Eventually, the entity help Horemshep convince Fayum that he was a hitherto unrevealed son of Amenhotep, and Yanis used his infantry to besiege Thebes and force a final confrontation with Eriemem and her forces. During the siege, Kishik was one of his key lieutenants.