Battle of Khaybar
When Muhammad married Khadija, he arranged for Barakah's freedom and marriage to a Khazrajite companion named Ubayd ibn Zaid. Through this marriage, Barakah bore a son named Ayman, and thus she was known as "Umm Ayman" ("Mother of Ayman"). Ubayd was killed fighting in the Battle of Khaybar. Ayman ibn Ubayd was later killed fighting in the Battle of Hunayn.