When a family cat died in ancient Egypt, family members would mourn by shaving off their eyebrows. They also held elaborate funerals during which they drank wine and beat their breasts. The cat was embalmed with a sculpted wooden mask and the tiny mummy was placed in the family tomb or in a pet cemetery with tiny mummies of mice.
The Rosetta Stone has the same inscription written in three languages; Ancient Egyptian hieroglyphs, Demotic, and Greek. Its discovery in 1799 was key to figuring out the hieroglyphic writing system, thus allowing modern historians to unlock the contents of many manuscripts and carvings that were previously unknown. The Rosetta Stone is currently located in the British Museum.