Usermaatre Setepenamun Osorkon II, a pharaoh of the Twenty-second Dynasty of Ancient Egypt and the son of Takelot I and Queen Kapes, rules Egypt around 872 BCE to 837 BCE from Tanis, the capital of this Dynasty.

After succeeding his father, he is faced with the competing rule of his cousin, king Harsiese A, who controls both Thebes and the Western Oasis of Egypt.

Osorkon fears the serious challenge posed by Harsiese's kingship to his authority but, when Harsiese conveniently dies in 860 BCE, Osorkon II ensures that this problem would not recur by appointing his own son Nimlot C as the next High Priest of Amun at Thebes.

This consolidates the pharaoh's authority over Upper Egypt and means that Osorkon II ruleds over a united Egypt.

Osorkon II's reign is a time of large scale monumental building and prosperity for Egypt According to a recent paper by Karl Jansen-Winkeln, king Harsiese A, and his son [..du] were only ordinary Priests of Amun, rather than High Priests of Amun, as was previously assumed.

The inscription on the Koptos lid for [..du], Harsiese A's son, never once gives him the title of High Priest.

demonstrates that the High Priest Harsiese who served is attested in statue CGC 42225 – which mentions this High Priest and is dated explicitly under Osorkon II – was, in fact, Harsiese B.

The High Priest Harsiese B served Osorkon II in his final 3 years.

This statue was dedicated by the Letter Writer to Pharaoh Hor IX, who was one of the most powerful men in his time.

However, Hor IX almost certainly lived during the end of Osorkon II's reign since he features on Temple J in Karnak which was built late in this Pharaoh's reign, along with the serving High Priest Takelot F(the son of the High Priest Nimlot C and therefore, Osorkon II's grandson).

Hor IX later served under both Shoshenq III, Pedubast I and Shoshenq VI.

This means that the High Priest Harsiese mentioned on statue CGC 42225 must be the second Harsiese: Harsiese B.