The most valiant Marquis — black crane at twilight who restores what reputation has lost and makes every art and science yield to the one who asks.
Naberius is described in the Lemegeton as the most valiant Marquis — the superlative is unusual, reserved for only a handful of spirits in the entire catalogue, and it establishes his character before his form is described. He is the champion among Marquises, the most courageous of his rank, the spirit who brings the greatest fighting quality to the twilight domain that all Marquises inhabit.
He appears as a black crane, or in some manuscript traditions as a crowing cock, fluttering about the circle before the conjurer. The two avian forms share important qualities despite their apparent difference: both are birds associated with specific times — the crane with the long migrations that mark seasonal transitions, the cock with the dawn that ends the night. Both have vocal qualities that carry across great distances — the crane's call and the cock's crow are among the most penetrating bird sounds in European acoustic tradition. Both are black in his specific manifestation, which shifts the usual associations of both birds into darker, more liminal registers.
The black crane in particular carries symbolic weight that the common crane does not. Cranes in ancient Greek tradition were associated with Hermes/Mercury as messenger birds and with the invention of writing — Hermes was said to have observed cranes in flight and derived the alphabet from the patterns of their formations. A black crane bringing cunning in all arts and sciences carries this Hermetic heritage: the bird of writing and communication, darkened into the domain of hidden or esoteric knowledge.
The qualifier most valiant connects Naberius to a tradition of the courageous teacher — the scholar who does not merely possess knowledge but defends it, who stands for the arts and sciences with the courage of the warrior. In the medieval tradition, valour was not merely physical bravery but the moral courage to uphold what was right against opposition. Naberius as the most valiant Marquis is the spirit who teaches with conviction, who restores honour because he is willing to fight for it.
Naberius holds two powers that form a coherent restoration-and-education pair: he restores lost dignities and honours, and he makes men cunning and skilful in all arts and sciences, with particular emphasis on rhetoric. The conjunction suggests a spirit who understands that knowledge and reputation are inseparable — that the arts and sciences are instruments of social standing as much as of intellectual satisfaction.
The relationship between restored dignity and acquired cunning is the relationship between social standing and the skills that justify it. In the world of the 17th-century conjurer, dignity and honour were not merely decorative — they determined access to patronage, opportunity and safety. To lose dignity was to lose the conditions necessary for the practice of any art. Naberius restores the social conditions for learning, and then fills them with the learning itself. He is the complete rehabilitation spirit: first the position, then the knowledge to fill it.
The name Naberius has attracted considerable scholarly attention because of its phonetic similarity to Cerberus — the three-headed dog of Greek mythology who guarded the entrance to Hades. The Latin Cerberus, transmitted through various phonological transformations across different manuscript traditions, could plausibly yield Naberius through the same scribal processes that produced many Goetia names from classical mythological figures.
If the Cerberus identification is correct, it illuminates Naberius's character significantly. Cerberus was not merely a guardian but a threshold-keeper — the creature who determined what could cross between the world of the living and the world of the dead. As a black crane who appears at twilight, Naberius occupies a similar liminal position: the bird at the boundary of day and night, the spirit at the boundary of what has been lost and what can be restored. The guardian of the threshold between dishonour and dignity, between ignorance and cunning.
The three-headed form of Cerberus would also connect to the multi-form nature suggested by Naberius's two possible appearances — crane or crowing cock — with a third implied by his human manifestation. Three forms for a spirit of threshold-keeping: the form that approaches across the day-night boundary (the crane of twilight appearance), the form that announces the end of night (the crowing cock), and the human form of the teacher who works in daylight. Each form governs a different temporal register; together they span the complete cycle.
In the Pseudomonarchia Daemonum, Weyer presents Naberius (as Naberus or Cerberus) with consistent powers. The nineteen legions he commands is one of the smallest commands in the Goetia — smaller even than Phenex's twenty. Nineteen is a prime number, the number of years in the Metonic cycle (after which the phases of the Moon return to the same positions relative to the solar calendar). Naberius commands the forces of the Metonic cycle: the restoration that comes with time's complete return to its starting point.
Naberius is invoked in situations of reputational recovery — after professional setbacks, public failures, or the accumulated damage of time and neglect to a person's standing and recognised skill. His most valiant quality marks him as a fighter for reputation: the spirit who does not merely console but actively works to restore what was taken. The black crane at twilight, fluttering about the circle, is already in motion — already doing the restorative work before the conjurer has finished speaking. He is the most valiant because he is also the most immediately active.