Duplex querela is a Latin term meaning, “double complaint”. Duplex querela is a procedure used in ecclesiastical law for challenging a bishop's refusal to do justice. Under duplex querela, the archbishop orders a judge considering parallel proceedings not to take any action against the complainant during the pendency of the suit. It is also an appeal to a person’s immediate superior, as when a bishop appeals to an archbishop. Duplex querela is also known as double quarrel.