The Four Angels at the Four Corners of the Earth and the Hymn of the Blessed from John's Apocalypse

In the upper zone, within a mandorla, two trees represent the earth and a ship the sea. Around the mandorla, four angels hold the heads of the four winds with their hands over their mouths to keep them in check. To the right, another angel gives the four the order to leave the earth and the land in peace. To the left, John. In the lower zone: John with one of the elders on the left. To the right, in a mandorla, God the Father on a throne surrounded by the symbols of the four evangelists. Above left and right, six angels; below them, six elders; and at the bottom, eight martyrs. Page 9 from a block book of the Revelations of John.