Revelation 6:2
So, I looked, and before me [stood] a white horse, and the man riding on it had a bow. And he was given a crown, and he rode out as a conqueror [going out] to conquer [someone].
Revelation 6:8
So, I looked and before me [stood] a pale green horse, and the name of the man riding on it was "Death," and the unseen place of departed spirits followed along behind him. And they were [both] given authority over one fourth of the earth, to kill people with swords, with famine, with terrible judgments and by wild animals of the earth.
Revelation 19:11
Then I saw heaven open, and there before me was a white horse whose rider was called "Faithful and True." And He [i.e., Christ] judges and wages war in a just way.
Revelation 20:11
Then I saw a great, white throne and Him who was seated on it [i.e., probably Christ]. Earth and heaven fled from His presence and they were not found anywhere [again].