Historically the title of bourgeois is acquired the year of the wedding as :
- by relief: The person inherits his father (bourgeois by relief at the time of his birth) and raises his title the year of his marriage.
- by purchase: The individual becomes bourgeois by buying his title in the year of his wedding.
In total a collection of more than 30 000 records, consisting of last and first names, place of birth, filiation, spouse, type of bourgeoisie, date of event and source.

• Registres de Bourgeoisie par relief et par achat, relevés aux archives municipales de Lille.