when was the first one composed?
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map of tombs in valley of the kings In 1799, members of Napoleon's expedition to Egypt (especially Vivant Denon) drew maps and plans of the known tombs, and for the first time noted the Western Valley who were these tombs built for? For the pharaohs and powerful nobles of the New Kingdom can you name some of the artefacts found inside these tombs? The royal tombs are decorated with scenes from Egyptian mythology and give clues as to the beliefs and funerary practices of the period. Almost all of the tombs seem to have been opened and robbed in antiquity, but they still give an idea of the opulence and power of the pharaohs. can you name some deities who feature in the mythology you just mentioned? Ra,  Osiris, Isis, Horus,  Set. do they appear in textual sources from that era? Yes,  "Teaching for King Merykara", "Tale of the Two Brothers", "The Blinding of Truth by Falsehood"
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Teaching for King Merykara [SEP] Introduction
The Teaching for King Merykara, alt. Instruction Addressed to King Merikare, is a literary composition in Middle Egyptian, the classical phase of the Egyptian language, probably of Middle Kingdom date (2025–1700 BC). In this "sebayt" the author has a First Intermediate Period king of Egypt possibly named Kheti address his son, the future king Merykara, advising him on how to be a good king, and how to avoid evil. Merykara is the name of a king of the 9th or 10th Dynasty, the line or lines of kings who ruled northern Egypt during a period of division, the First Intermediate Period (about 2150–2025 BC).