In Context

10 and they have tails like to scorpions, and stings were in their tails; and their authority is to injure men five months;

11 and they have over them a king — the messenger of the abyss — a name is to him in Hebrew, Abaddon, and in the Greek he hath a name, Apollyon.

12 The first woe did go forth, lo, there come yet two woes after these things.

13 And the sixth messenger did sound, and I heard a voice out of the four horns of the altar of gold that is before God,

14 saying to the sixth messenger who had the trumpet, 'Loose the four messengers who are bound at the great river Euphrates;'

15 and loosed were the four messengers, who have been made ready for the hour, and day, and month, and year, that they may kill the third of men;

Revelation 9:13 in Other Translations