A larger detail of The Riders on Lion-Headed Horses, Silos Beatus Codex, Beatus of Liébana, Spain.
Sixth Trumpet: The Army Of Horsemen On Lion-Headed Horses
And I saw the horses in the vision. And the horsemen had breastplates of fire, hyacinth, and sulfur. And the heads of the horses were like the heads of lions. And from their mouths came fire, smoke, and sulfur. And one-third part of men was slain by these three afflictions. For the power of these horses is in their mouths and tails. Their tails resemble serpents, and it is the heads that cause harm. And the men who were not slain by these afflictions did not repent from the works of their hands, from worshiping demons or idols, or from their murders, drugs, fornications, and thefts. (Rev. 9:17–21)
The manuscript was copied in 1090 and the illuminations completed in 1109 in the Spanish monastery of Santo Domingo de Silos, near Burgos.