Since Shoshenq VI's prenomen is inscribed on Hor IX's funerary cones, this indicates that Hor IX outlived Pedubast I and made his funeral arrangements under Shoshenq VI instead.

[3] Shoshenq VI was presumably Crown prince Osorkon B's chief rival at Thebes after the death of Pedubast I.

He was defeated and ousted from power at Thebes in Year 39 of Shoshenq III by Prince Osorkon B.

In this decisive Year, Osorkon B explicitly states in Nile Quay Text No.7 that he and his brother, General Bakenptah of Herakleopolis, conquered Thebes and "overthrew everyone who had fought against them.

(NOTE: The old king Shoshenq IV in pre-1993 books and journal articles has been renamed Shoshenq VI by Egyptologists today because he was a Theban king who is only attested by Upper Egyptian documents.