"barons, my lords, [charlemagne] left us in this place. we know our duty: to die like good men for our king. fight to defend the holy christian faith."
-the song of roland, 12th century a. d.
according to the passage, "charlemagne" is most likely
a) the name of the god.
b) the hero of the poem.
c) the title of the weapons used.
d) the king whom they are to protect.