Revelation 12:1-4

And another sign appeared in heaven: behold, a great red dragon, with seven heads and ten horns, and on his heads seven diadems. His tail swept down a third of the stars of heaven and cast them to the earth.

From a watercolour painting by William Blake entitled 'The Great Red Dragon and the Woman Clothed with the Sun' held at the National Gallery of Art, Washington D.C.

This is one of four studies on the subject painted by Blake between 1805 and 1810.