Derived from early Slavic flag-like objects, a royal banner of arms dates as far back as the 11th century. A symbol of royal authority, it was used at coronations and in battles. In the interwar period, it was replaced with the Banner of the Republic of Poland, which was part of the presidential insignia. A national banner is not mentioned in the current (2007) regulations on Polish national symbols, although today's presidential jack is based directly on the pre-war design for the Banner of the Republic.