The Magistrates, tasked with ensuring Swedish law was followed, had no power to decide any measures without the cooperation of the Council of Burghers, and in more important matters the decisions had to be reviewed by Marstrand's inhabitants.
Magistraatidel, kelle ülesandeks oli kindlustada Rootsi seaduse järgimine, ei olnud võimu teha otsuseid ilma linnakodanike nõukoguta ja olulisemates asjades pidid otsused üle vaatama ka Marstrandi elanikud.