Osorkon IV was a ruler of Lower Egypt who, while not always listed as a member of the Twenty-second dynasty of Egypt, he is attested as the ruler of Tanis, and thereby one of Shoshenq V's successors. Therefore he is sometimes listed as part of the dynasty, whether for convenience or in fact.
His parentage is uncertain: he could be a son of Shoshenq V. His mother, named on an electrum headpiece in the Louvre, is Tadibast III.
Read more about Osorkon IV: Reign, Relationship With Assyria