 During the German Revolution of 1918–19 the last reigning grand duke of Saxe-Weimar-Eisenach, William Ernest, had to abdicate and went in exile to Heinrichau in Silesia.The period in German history from 1919 to 1933 is commonly referred to as the Weimar Republic, as the Republic's constitution was drafted here.Berlin as the capital was considered too dangerous for the National Assembly to use as a meeting place, because of its street rioting after the 1918 German Revolution.