Maatkare B was a wife of Pharaoh Osorkon I

Osorkon I

The son of Shoshenq I and his chief consort, Karomat A, Osorkon I was the second king of Egypt's 22nd Dynasty and ruled around 922 BC – 887 BC. He succeeded his father Shoshenq I who probably died within a year of his successful 923 BC campaign against the kingdoms of Israel and Judah...

 and the mother of Pharaoh Sheshonk II. Maatkare was the daughter of Psusennes II

Psusennes II

Titkheperure or Tyetkheperre Psusennes II Greek Ψουσέννης] or Hor-Pasebakhaenniut II Egyptian ḥr-p3-sb3-ḫˁỉ--nỉwt], was the last king of the Twenty-first dynasty of Egypt. His royal name means "Image of the transformation of Re" in Egyptian. Psusennes II is often considered the same person as...

 (also known as Pasebkhanut II).

Maatkare is known from several sources. 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

Osorkon I

The son of Shoshenq I and his chief consort, Karomat A, Osorkon I was the second king of Egypt's 22nd Dynasty and ruled around 922 BC – 887 BC. He succeeded his father Shoshenq I who probably died within a year of his successful 923 BC campaign against the kingdoms of Israel and Judah...

 and Maatkare. Maatkare is called the King's Daughter of ... Har-Psusennes II

Psusennes II

Titkheperure or Tyetkheperre Psusennes II Greek Ψουσέννης] or Hor-Pasebakhaenniut II Egyptian ḥr-p3-sb3-ḫˁỉ--nỉwt], was the last king of the Twenty-first dynasty of Egypt. His royal name means "Image of the transformation of Re" in Egyptian. Psusennes II is often considered the same person as...

, beloved of Amun

Amun

Amun, reconstructed Egyptian Yamānu , was a god in Egyptian mythology who in the form of Amun-Ra became the focus of the most complex system of theology in Ancient Egypt...

. On a statue from the 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...

 Cachette, also dedicated by her son Shoshenk, Maatkare has the titles Prophetess of Hathor

Hathor

Hathor , is an Ancient Egyptian goddess who personified the principles of love, beauty, music, motherhood and joy. She was one of the most important and popular deities throughout the history of Ancient Egypt...

, Lady of Dendera

Dendera

Dendera is a small town in Egypt situated on the west bank of the Nile, about 5 km south of Qena, on the opposite side of the river.-History:...

, God's Mother of Harsomtus, and King's Daughter.

A 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...

 inscription on the seventh pylon names a woman called Maatkare, King's Daughter of Psusennes Beloved of Amun

Amun

Amun, reconstructed Egyptian Yamānu , was a god in Egyptian mythology who in the form of Amun-Ra became the focus of the most complex system of theology in Ancient Egypt...

, and this is usually though to refer to Maatkare B.