In 1999, Chris Bennett made a case for a Queen Karimala known from an inscription in the temple of Semna being the daughter of Osorkon the Elder.

Based on the calculation of this lunar Tepi Shemu feast, Year 17 of Siamun has been shown by the German Egyptologist Rolf Krauss to be equivalent to 970 BC.

[8] A stela dated to Siamun's Year 16 records a land-sale between some minor priests of Ptah at Memphis.

Prior to Siamun's reign and all throughout the Middle and New Kingdom, the word pharaoh referred only to the office of the king.

[11] Siamun constructed and dedicated a new temple to Amun at Memphis with 6 stone columns and doorways which bears his royal name.

In Upper Egypt, he generally appears eponymously on a few Theban monuments although Siamun's High Priest of Amun at Thebes, Pinedjem II, organised the removal and re-burial of the New Kingdom royal mummies from the Valley of the Kings in several hidden mummy caches at Deir El-Bahari Tomb DB320 for protection from looting.

[12] One fragmentary but well known surviving triumphal relief scene from the Temple of Amun at Tanis depicts an Egyptian pharaoh smiting his enemies with a mace.

Paul S. Ash has challenged this theory, stating that Siamun's relief portrays a fictitious battle.

This identification is supported by Kenneth Kitchen and William G. Dever,[19][20] but has been challenged by other scholars such as Paul S. Ash and Mark W. Chavalas, with the latter stating that "it is impossible to conclude which Egyptian monarch ruled concurrently with David and Solomon".

Lipiński also argued that the then-unfortified Gezer was destroyed late in the 10th century, and that its taker was most likely pharaoh Shoshenq I of the 22nd Dynasty.

[23] This conclusion is also shared by Krystal V. L. Pierce, who also points to a scarab of Siamun discovered in Tell el Far'ah as further evidence for his campaign in the Levant.