He was, in 1831, one of the authors of the Belgian Constitution. When Surlet de Chokier was elected regent of the kingdom, Defacqz was named secretary-general with the ministry of Justice. But soon he gave up these functions to enter the judiciary.
In 1831, he was one of the authors of the Belgian Constitution. When Surlet de Chokier was elected regent, Defacqz served as secretary-general in the Ministry of Justice. However, he eventually left these roles to enter the judiciary.