One that opposes another in a battle, contest, controversy, or debate
See syn. study at
It is not easy to determine the antagonist he had in view.
In his youth he was an antagonist of Mahomet.
Ivan was also unfortunate in having for his chief antagonist Stephen Bathory, one of the greatest captains of the age.
One strong antagonist to Moawiya remained, in the person of Ziyad.
At the beginning of the year 1701 he was sent into Italy once more to oppose his old antagonist Catinat.