He was an ally of Tefnakht of Sais who resisted the invasion of Lower Egypt by the Kushite king Piye.

[1] Iuput II ruled during a chaotic time of the Third Intermediate Period when several kings controlled Lower Egypt, including Osorkon IV at Bubastis and prince Tefnakht at Sais.

[2] The respected British Egyptologist Kenneth Kitchen states that this dated stela which features the great chief of the Ma Smendes, son of Harnakht and ruler of Mendes, bears Iuput's name but lacks his royal name or prenomen.

[4] After Piye defeated Tefnakht's coalition and conquered Lower Egypt around Year 20 of his reign, the Nubian king permitted Iuput II to remain in power as a local governor of Leontopolis according to his Victory Stela from Jebel Barkal.

Other monuments or objects from his reign include "a statue-base of Usimare Setepenamun, Iuput Meryamun Si-Bast from Tell el Yahudieh, a glazed plaque (see picture) now in the Brooklyn Museum, and a bronze door-hinge...from Tell Moqdam (Leontopolis) bearing identical titles of the king along with [a] mention of the Chief Queen, Tent-kat [...] and some obscure epithets.