[link to www.khouse.org]

And when he had opened the fourth seal, I heard the voice of the fourth beast say, Come and see. And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him. And power was given unto them over the fourth part of the earth, to kill with sword, and with hunger, and with death, and with the beasts of the earth. - Revelation 6:7, 8

The actual word for "pale" is clwros ( chloros, which is green or yellowish pale, and this horseman is traditionally viewed as pestilence).