Belamith is a demon appearing in the grimoire Clavicula Salonomis which says he can confer invisibility on those summoning him He is conjured through an invisibility spell overseen by Almiras, described as a master of invisibility. Thus both demons appear in Mathers’ translation of the Sacred Magic of Abramelin the Mage. A.G.H.
Belanger, Michelle. The Dictionary of Demon: Names of the Damneds. Llewellen Publications. 2010. ebook.