Coemptio could be contracted not only with a husband ("for the sake of marriage"), but also with an outsider ("for the sake of trust"). A wife who had become cum manu through the process of coemptio was emancipated upon divorce.
In Roman law, coemptio allowed for a contract to be made not only between a husband and wife ("for the sake of marriage"), but also with someone outside the marriage ("for the sake of trust"). A woman who became "cum manu" through this process was freed from her marital obligations upon divorce.