Why is Alexander the Great considered the first true superhero of the Western Civilization?

Alexander the Great is considered to be a very significant
figure in Western Civilization because of the extent of the empire that he conquered and
the lasting impact that his conquests had.  However, it is going a bit far to call him a
"superhero" given that that term is generally used to refer to people who have
superhuman powers that they use for the good of their
societies.

Alexander, of course, conquered an empire that
stretched as far as what is now India.  He and his descendants were not able to hold all
of those conquests, but their actions did create a large Hellenistic civilization in the
Middle East, stretching as far as what is now Iraq.  The Hellenistic culture also had a
great impact on the Romans, who saw Alexander and the Hellenistic culture as their role
models.  Because he conquered so much territory and because the Hellenistic society that
arose from his conquests was so influential, Alexander is a major figure in Western
Civilization.

However, calling him a super hero seems
excessive.  Even if we say that his leadership was superhuman, it is not as if he was
selflessly working for the common good in the way that superheroes do.  Instead, he was
trying to gain more power for himself.  This is not the act of a
superhero.