a ruler is called "Fürst"
a single ruler
the president of Austria is Alfred Gusenbauer.
an emperor
Germany and Austria
Joseph II
Charles I was the ruler of Austria from 1916-1918. Francis Joseph I was the ruler prior but died midway into the war.
The ruler of Austria
Franz Joseph I was the ruler of Austria-Hungary durning World War I.
Called a straight edge
Karl Seitz, president of the Constituent National Assembly (1919-1920)
A egept ruler is called a Pharaoh