Sayyidah Aishah (may Allah be pleased with her) said that Barirah was freed while she was married to Mughith, who was a slave of the family of Abu Ahmad. The Prophet (peace and blessings be upon him) gave Barirah the choice and said: "If Mughith has intercourse with you, then you will have no choice."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 14283