Miramir was a human female who worked as a junk trader during the New Republic Era. Her husband Dathan was the cloned "son"—an artificial Strand-Cast—of Darth Sidious, the Dark Lord of the Sith and Galactic Emperor. Miramir had a Force-sensitive child with Dathan, a daughter named Rey, who was born in 15 ABY. Though Miramir's husband lacked the ability to use the Force, Rey was born Force-sensitive as a result of her father's genetic connection to the Palpatine bloodline.
Despite their family's connection to the Dark Lord of the Sith, Miramir and Dathan chose to live as anonymous junk traders on the desert planet of Jakku. They succeeded in hiding Rey from Sidious, who intended to use Rey as a vessel for his spirit, by leaving her on Jakku with Unkar Plutt. Miramir and her husband were subsequently captured and killed by the Sith assassin Ochi, whom the Emperor had sent to retrieve his granddaughter.