Hieroglyphs on the coffin say it contained a high priestess called Mer-Neith-it-es from 600 BC.
Researchers were "really, really surprised" to find that tattoos on two 5,000-year-old mummies.
He is her great-great-great-great-great-great-great grandson.
Some of the papyrus scraps carry everyday notes like shopping lists or tax returns.
The study looked at DNA from more than 150 ancient Egyptian mummies.