question #3 Sahih al-Bukhari 4201, Book 64, Hadith 241 : What are the implications of marrying a captive in Islamic history and law?

Anas bin Malik said, “The Prophet (ﷺ) took Safiya as a captive. He manumitted her and married her.”
Thabit asked Anas, “What did he give her as Mahr (i.e. marriage gift)?” Anas replied. “Her Mahr was
herself, for he manumitted her.”