magistrate -
A judicialofficer with limited authority to administer and enforce the law. A magistrate's court may have jurisdiction in civil or criminal cases, or both.
Wikipedia
A magistrate is a judicial officer; in ancient Rome, the word magistratus denoted one of the highest government officers with judicial and executive powers. Today, in common law systems, a magistrate has limited law enforcement and administration authority. In civil law systems, a magistrate might be a judge in a superior court; the magistrate's court might have jurisdiction over civil cases and criminal cases.