Mahat chapel of Mentuhotep II
The Mahat chapel of Nebhepetre Mentuhotep II is an ancient Egyptian funerary chapel (Egyptian: mahat) built by king Mentuhotep II (reigned c. 2046 BC – 1995 BC) at Abydos.
Source: Wikipedia — Mahat chapel of Mentuhotep II (CC BY-SA 4.0)