This supporting image is unique because it shows 2 beasts mouths together creating an entrance into the depths of Hell. The mouths of Hell are packed full of unworthy people and are being locked out by an angel with a key to the gates. This image is called Hellmouth, locked by an archangel, from the Winchester Psalter of about 1150.

Source: die_Pforten_der_Unterwelt_mit_einem_Schl├╝sel.jpg
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Reuse License: Public Domain