Flag and coat of arms of the Sovereign Military Order of Malta
The flag and coat of arms of the Sovereign Military Order of Malta, or the Jerusalem flag, display a white cross on a red field (blazon gules a cross argent), ultimately derived from the design worn by the Knights Hospitaller during the Crusades. The flag represents the Sovereign Military Order of Malta as a sovereign institution.
Source: Wikipedia — Flag and coat of arms of the Sovereign Military Order of Malta (CC BY-SA 4.0)