This paper discusses matrimony of enslaved people in Lisbon in the early modern age. Portuguese bishops created norms related to matrimony specifically directed at enslaved people. The main objective was to promote catholic marriage within this group. The existence of these norms should be understood in the context of four crucial factors: first, the Tridentine emphasis of doctrinal instruction and sacramental practice as a form of salvation. Second, the increasing number of enslaved people in the kingdom. Third, the cultural, linguistic, and social barriers inherent to this group of people. Four, the enslaved were commonly prevented from marrying by their masters, since they were considered mere objects of work. Notwithstanding the obstacles created by masters, among which physical abuse was frequently included, many enslaved people married, nonetheless. The formal regulation of unions was essential for the church. However, for enslaved people in Lisbon it was not just a question of religious practice connected to spiritual benefits. It was related to family ties and kinship. Moreover, marriage was a form of resistance against masters.