A statue of the Nile-god - now in the British Museum (BM 8) - was dedicated by the High Priest of Amun Shoshenk, and he lists his parents as Osorkon I and Maatkare.
Kenneth Kitchen, in his latest 1996 edition of '’The Third Intermediate Period in Egypt (c.1100–650 BC)’', maintains that Shoshenq II was the High Priest of Amun Shoshenq C, son of Osorkon I and Queen Maatkare, who was appointed as the junior coregent to the throne but predeceased his father.
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A prime example is the Mummy of Khonsmaakheru in Hamburg which contains separate bandages dating to Years 11, 12, and 23 of Osorkon I—or a minimum period of 12 Years between their creation and final use.
Osorkon II | Osorkon I | Osorkon III |
One of the most important of these people was the High Priest of Amun Shoshenq C, son of Osorkon I, who served in office during his father's reign at Thebes.
Harsiese A, as the son of the High Priest Shoshenq C and grandson of Osorkon I, or a hypothethical king named Maatkheperre Shoshenq must have appeared as a rival.