The two-faced monster who teaches the stars and the earth — and moves the dead from their graves to place strange lights above them, visible to all who pass in the night.
Bifrons appears first as a monster — like Ronové (27th), the form is described only by category, not specified anatomically. When commanded, he takes human form. The name Bifrons is itself the most explicit characterisation in his description: bifrons is Latin for two-faced, from bi (two) and frons (forehead, face). The spirit whose name is Two-Faced and whose initial form is simply monstrous arrives at the boundary between what is seen and what is hidden, between the face shown to the living world and the face turned toward the dead.
The two-faced figure in Roman tradition is Janus — the god of doorways, of beginnings and endings, of the passage between states. Janus looks simultaneously backward and forward, into the old year and the new, into the room being entered and the room being left. As the presiding god of all transitions, Janus's two faces are not a sign of deception but of comprehensiveness: he sees both sides of every threshold because his nature is the threshold itself. Bifrons whose name echoes Janus is the spirit of the threshold between life and death — the Earl who teaches the stars above and tends the graves below, who moves the bodies of the dead and places lights over them for the living to see.
Six legions is the smallest command in the entire Goetia — an extraordinary contrast with the scope of his powers. Most spirits command tens of legions; Bifrons commands six. Six is the number of the perfect material form in Kabbalistic tradition: the six directions of space (north, south, east, west, up, down), the six faces of the cube, the six days of creation. Bifrons commands the smallest force with the most precisely defined material domain: the exact dimensions of the grave, the exact geometry of the space between the living world and its threshold.
Bifrons holds five powers that span the complete arc from celestial knowledge through natural philosophy to the management of the dead: astrology, geometry, arithmetic, the virtues of herbs and stones and woods, and the movement of corpses with the placing of strange lights over graves. He is simultaneously an astronomer, a mathematician, a natural philosopher, and a spirit of the graveyard who manipulates the dead and marks their resting places with supernatural illumination.
The coherence of Bifrons's domain is the coherence of the boundary — the threshold between above and below, between the living and the dead, between the celestial mathematics that governs the universe and the biological dissolution that returns the body to the earth. He teaches what the living need to know (mathematics, natural science) and manages what the dead inhabit (graves, relocated bodies, strange lights). His two faces are the face of the teacher and the face of the graveyard keeper, and Bifrons is both simultaneously.
The strange lights that Bifrons places over graves connect him to one of the most widespread and genuinely witnessed natural phenomena of pre-modern Europe: the ignis fatuus (foolish fire), known in English as will-o'-the-wisps, and in Welsh as corpse candles (canwyll corff). These lights — which actually result from the spontaneous ignition of methane and phosphine gases produced by decomposing organic matter — were observed over marshes and burial grounds for millennia before their chemical explanation was understood.
In Welsh tradition, corpse candles were specifically associated with recent deaths and burials: a light seen moving toward a churchyard foretold a coming death, and lights burning over graves marked where the recently dead lay. In Irish folklore, the same lights were the souls of the unbaptised, condemned to wander between the living and dead worlds. In German tradition, the Irrlicht (error-light) led travellers astray in swamps and marshes. The same natural phenomenon, observed universally, interpreted as the souls of the dead by every culture that encountered it.
Bifrons's power to place these lights over graves is the grimoire tradition's way of identifying the intelligence behind the phenomenon — the natural force that produces the spontaneous grave-lights, named and personified as a spirit who can be invoked. The two-faced monster who teaches astrology and moves corpses between graves is also the being whose domain includes the natural process that produces the most uncanny optical phenomenon associated with death and burial.
The woods component of Bifrons's natural philosophy connects to this tradition as well: the yew tree found in British and Irish churchyards, the elder whose hollow berries are associated with the dead in folk tradition, the ash whose roots descend to the underworld in Norse cosmology — the trees of the graveyard are Bifrons's trees, the woods he knows the virtues of are the woods that stand at the boundary between the living world and the ground of the dead.
Bifrons is the Goetia's most explicitly liminal spirit — the two-faced being at the threshold between the celestial and the chthonic, between mathematical knowledge and the management of the dead, between the living who observe his lights and the dead whose graves he illuminates. Those who work with him invoke the complete boundary-keeper: the astronomer who measures the sky, the mathematician who counts the earth, the herbalist who knows the graveyard trees, and the spirit who lights the graves of the dead so that the living, passing at night, can see where the boundary is.