This fellow is Jack Crowley, trapped between heaven and hell he is bound to walk the earth for eternity. Pissing of Lucifer by sealing demons and other foul creatures in his spare time.
He imprisons them them in a place called the Undertow (heaven nor hell) and writes the seal in his countles grimoires for save keepings.
He is at it for atleast 400 year but not even Jack knowes for sure
Samigina ~ one of the many trapped creatures [link]