The demon Jambex appears in the grimoire The Book of Oberon
From The Book of Oberon, Dan Harms edition:
Jambex, a marquis, a captain, and a great governor; he appeareth like a woman, and speaketh pleasantly, and he giveth the love of great men, and of new men, and that willingly, and the master must make an image of wax, and in the forehead thereof, to write that love overcometh love, and thou do cause Jambex then to consecrate that image, so written, thou shalt cause a man or woman to come where that thou wilt, set that image for them to come to, and he hath under him 25 legions.
Timeline of related events
1577Book of Oberon completed (lists this demon)