I found it. Mercheta mulierum was a custom, according to which, brides, at the first night of their marriage belonged to the governor, lord and such a people. (In persian we colled the "Kalle Gonde" meaning "big head" a term for all high ranks people who have dominant power.
Thanks very much.
Pars, I think you're referring to a different custom.
The idea of the bride's first marriage night being spent with the local lord was referred to as Prima Nocta. (There was bizarrely a reference to this in Avengers Age of Ultron, during the scene where the Avengers try lifting Thor's hammer)
My understanding of mercheta mulierum is that it's more of a marriage tax, paid to the local lord. Somewhat akin to a dowry, but paid to the local lord instead of the husband.
If you look at the Latin, mercheta is: (source cited in link)
"A fine payable by a villein for license to give his daughter in marriage| and in Scotland at his own marriage." (A villein is a type of feudal tenant in Medieval England.)
Mulierum is of course the Latin accusative of mulier - 'woman' or 'wife'.