What are the similarities between monarchy and dictatorship?

A key similarity
between a monarchy and a dictatorship is that both of these types of government have
one single head of state.  In a monarchy, the head of state is a
king or queen, but, in a dictatorship, the head of state can be any person. Generally, a
dictatorship is ruled by a single politician. In Nazi Germany, for example, the dictator was
Adolf Hitler, the head of the Nazi Party.

In an absolute monarchy (where the
monarch's power has no limits), we find another similarity with a dictatorship. Namely, that
both a monarch and a dictator rule with absolute power. They are in
charge of every aspect of political and public life, and cannot be overruled by anybody else.
For the citizens of an absolute monarchy or a dictatorship, the power of the head of state
severely limits their freedoms and their rights.

For more information, see
the reference links provided.