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"Mummies of pharaohs" as a possessive noun could be "the pharaohs' mummies." This indicates that the mummies belong to the pharaohs.
how did pharaohs interact with neighbors
You can write "mummies of the Pharaohs" to indicate that the mummies belong to the Pharaohs.
The Pharaohs was created in 1962.
THey became Pharaohs by family, it gets past down by oldest to youngest.