Usermaatre Setepenamun Osorkon III Si-Ese was the famous Crown Prince and
High Priest of Amun Osorkon B, son of
Takelot II by his
Great Royal Wife Ka<ro>mama-Merytmut II. Prince Osorkon B is best attested by his Chronicle—which consists of a series of texts documenting his activities at
Thebes—on the Bubastite Portal at
Karnak. He later reigned as king Osorkon III in Upper Egypt for twenty-eight years after defeating the rival forces of
Pedubast I/
Shoshenq VI who had apparently resisted the authority of his father here. Osorkon ruled the last five years of his reign in
coregency with his son,
Takelot III, according to Karnak
Nile Level Text No. 13. Osorkon III's formal
titulary was long and elaborate: Usermaatre Setepenamun, Osorkon Si-Ese Meryamun, Netjer-Heqa-waset.
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