History of Magic is a core class and subject taught at
Hogwarts School of Witchcraft and Wizardry. This class
is a study of magical history. This is one of the subjects
where the use of magic practically isn't necessary.
History of Magic is taught from the first year to the fifth,
with the option of N.E.W.T. courses in sixth and seventh year.
The professor of this subject taught at Hogwarts for many
years before his death he was Cuthbert Binns
and even after his death he continued teaching as a ghost.
About Emeric the Evil.