Nimlot C was the High Priest of Amun at Thebes

Thebes, Egypt

Thebes is the Greek name for a city in Ancient Egypt located about 800 km south of the Mediterranean, on the east bank of the river Nile within the modern city of Luxor. The Theban Necropolis is situated nearby on the west bank of the Nile.-History:...

 during the latter part of the reign of his father Osorkon II

Osorkon II

Usermaatre Setepenamun Osorkon II was a pharaoh of the Twenty-second Dynasty of Ancient Egypt and the son of Takelot I and Queen Kapes. He ruled Egypt around 872 BC to 837 BC from Tanis, the capital of this Dynasty. After succeeding his father, he was faced with the competing rule of his cousin,...

. He died before the end of his father's reign since his son Takelot F (the future king Takelot II

Takelot II

Hedjkheperre Setepenre Takelot II Si-Ese was a pharaoh of the Twenty-Third Dynasty of Ancient Egypt in Middle and Upper Egypt. He has been identified as the High Priest of Amun Takelot F, son of the High Priest of Amun Nimlot C at Thebes and, thus, the son of Nimlot C and grandson of king Osorkon...

) succeeded him in office as High Priest of Amun towards the end of Osorkon II's reign.

This is established from the reliefs of Temple J at Karnak

Karnak

The Karnak Temple Complex—usually called Karnak—comprises a vast mix of decayed temples, chapels, pylons, and other buildings, notably the Great Temple of Amun and a massive structure begun by Pharaoh Ramses II . Sacred Lake is part of the site as well. It is located near Luxor, some...

which depicts the High Priest Takelot F as the dedicant at a religious ceremony and mentions the ruling king of Egypt as Pharaoh Osorkon II. Temple J has been dated to the final years of Osorkon II's reign.