The exterior features of the set of buildings reflect a wide breadth of Frankfurt and Germany's history, even though they were designed at the beginning of the 20th century. The famous three-peaked façade has medieval elements of design. The left-hand corner of the Alt-Limpurg displays the so-called Frankfurtia, the female embodiment of the city. In the middle, the Haus Römer shows the four kaisers of the Holy Roman Empire, two city coats of arms, a clock face, and a placard describing the most important facts about the building. The four kaisers are Frederick Barbarossa (the first king to be elected in Frankfurt), Louis the Bavarian (who gave convention rights to the city and allowed an expansion of the city), Charles IV (who made Frankfurt the location of the Kaiser selection vote), and Maximilian II (the first kaiser to be crowned in Frankfurt cathedral).