Question: What is the ruler of the underworld in ancient Egypt a part of?

Knowledge 1: Hapi (Son of Horus)
Hapi, sometimes transliterated as Hapy, is one of the Four sons of Horus in ancient Egyptian religion, depicted in funerary literature as protecting the throne of Osiris in the Underworld. Hapi was the son of Heru-ur and Isis or Serqet. He is not to be confused with another god of the same name. He is commonly depicted with the head of a hamadryas baboon, and is tasked with protecting the lungs of the deceased, hence the common depiction of a hamadryas baboon head sculpted as the lid of the canopic jar that held the lungs. Hapi is in turn protected by the goddess Nephthys. When his image appears on the side of a coffin, he is usually aligned with the side intended to face north. When embalming practices changed during the Third Intermediate Period and the mummified organs were placed back inside the body, an amulet of Hapi would be included in the body cavity. [SEP] Knowledge 2: Egypt
Egypt has one of the longest histories of any modern country, arising in the tenth millennium BC as one of the world's first nation states. Considered a cradle of civilisation, Ancient Egypt experienced some of the earliest developments of writing, agriculture, urbanisation, organised religion and central government. Iconic monuments such as the Giza Necropolis and its Great Sphinx, as well the ruins of Memphis, Thebes, Karnak, and the Valley of the Kings, reflect this legacy and remain a significant focus of archaeological study and popular interest worldwide. Egypt's rich cultural heritage is an integral part of its national identity, having endured, and at times assimilated, various foreign influences, including Greek, Persian, Roman, Arab, Ottoman, and European. Although Christianised in the first century of the Common Era, it was subsequently Islamised due to the Islamic conquests of the seventh century.
Knowledge 1: Green
For the ancient Egyptians, green had very positive associations. The hieroglyph for green represented a growing papyrus sprout, showing the close connection between green, vegetation, vigor and growth. In wall paintings, the ruler of the underworld, Osiris, was typically portrayed with a green face, because green was the symbol of good health and rebirth. Palettes of green facial makeup, made with malachite, were found in tombs. It was worn by both the living and dead, particularly around the eyes, to protect them from evil. Tombs also often contained small green amulets in the shape of scarab beetles made of malachite, which would protect and give vigor to the deceased. It also symbolized the sea, which was called the "Very Green." [SEP] Knowledge 2: Hapi (Son of Horus)
Hapi, sometimes transliterated as Hapy, is one of the Four sons of Horus in ancient Egyptian religion, depicted in funerary literature as protecting the throne of Osiris in the Underworld. Hapi was the son of Heru-ur and Isis or Serqet. He is not to be confused with another god of the same name. He is commonly depicted with the head of a hamadryas baboon, and is tasked with protecting the lungs of the deceased, hence the common depiction of a hamadryas baboon head sculpted as the lid of the canopic jar that held the lungs. Hapi is in turn protected by the goddess Nephthys. When his image appears on the side of a coffin, he is usually aligned with the side intended to face north. When embalming practices changed during the Third Intermediate Period and the mummified organs were placed back inside the body, an amulet of Hapi would be included in the body cavity.
Knowledge 1: Green
For the ancient Egyptians, green had very positive associations. The hieroglyph for green represented a growing papyrus sprout, showing the close connection between green, vegetation, vigor and growth. In wall paintings, the ruler of the underworld, Osiris, was typically portrayed with a green face, because green was the symbol of good health and rebirth. Palettes of green facial makeup, made with malachite, were found in tombs. It was worn by both the living and dead, particularly around the eyes, to protect them from evil. Tombs also often contained small green amulets in the shape of scarab beetles made of malachite, which would protect and give vigor to the deceased. It also symbolized the sea, which was called the "Very Green." [SEP] Knowledge 2: Upper and Lower Egypt
The two kingdoms of Upper and Lower Egypt were united c. 3000 BC, but each maintained its own regalia: the hedjet or White Crown for Upper Egypt and the deshret or Red Crown for Lower Egypt. Thus, the pharaohs were known as the rulers of the Two Lands, and wore the pschent, a double crown, each half representing sovereignty of one of the kingdoms. Ancient Egyptian tradition credited Menes, now believed to be the same as Narmer, as the king who united Upper and Lower Egypt. On the Narmer Palette the king is depicted wearing the Red Crown in one scene and the White crown in another, and thereby showing his rule over both Lands.

Answer: ancient Egyptian religion