What color does the horse of the fourth Horseman of the Apocalypse (Death) have?

The Four Horsemen of the Apocalypse are described in the last book of the New Testament of the Bible, the Book of Revelation by John of Patmos, at 6:1–8. The chapter tells of a book or scroll in God's right hand that is sealed with seven seals. The Lamb of God opens the first four of the seven seals, which summons four beings that ride out on white, red, black, and pale horses.

The fourth and final Horseman is named Death. Known as "Θάνατος/Thanatos", of all the riders, he is the only one to whom the text itself explicitly gives a name. Unlike the other three, he is not described carrying a weapon or other object, instead he is followed by Hades (the resting place of the dead). However, illustrations commonly depict him carrying a scythe (like the Grim Reaper), sword, or other implement.

The color of Death's horse is written as khlōros (χλωρός) in the original Koine Greek, which can mean either green/greenish-yellow or pale/pallid. The color is often translated as "pale", though "ashen", "pale green", and "yellowish green" are other possible interpretations (the Greek word is the root of "chlorophyll" and "chlorine"). Based on uses of the word in ancient Greek medical literature, several scholars suggest that the color reflects the sickly pallor of a corpse. In some modern artistic depictions, the horse is distinctly green.

The Greek word for plague is θανάτῳ, which is a variation of Θάνατος, indicating a connection between the Fourth Horseman and plague.