Nonetheless in 1211, Louis joined the Hohenstaufen party again; Emperor Frederick II rewarded him with the Palatinate of the Rhine in 1214: Louis's son Otto II was married to Agnes of the Palatinate, a granddaughter of Duke Henry the Lion and Conrad of Hohenstaufen. With this marriage, the Wittelsbach inherited the Palatinate and ultimately kept it as a Wittelsbach possession until 1918. Since that time also, the lion has become a heraldic symbol in the coat of arms for Bavaria and the Palatinate.