Isis and Osiris
The myth of Persephone, Demeter, and Hades definitely has some parallels in other cultures. Some have compared it to the myths surrounding the Egyptian gods Isis and Osiris. Osiris, like Hades, was said to be the ruler of the underworld, and his wife was Isis, a mother goddess among many other things. Isis is like a lot of Greek goddesses squished together, Persephone and Demeter among them.
Probably the biggest myth of Osiris and Isis the one in which Osiris is betrayed and dismembered by his brother, Set. Isis puts him back together again, and he is reborn. So, like Persephone, Osiris came to represent the renewal of life. It's interesting that, in this Egyptian take on the theme, it's the lord of the dead, himself, and not his wife, that's reborn.