Palladists were members of The Order of Palladium, a satanic group started in France in 1737. The order had two degrees, "Adelph" and "Companion of Ulysses." Women members were called "Companions of Penelope." The order was broken up by French law enforcement a few years after it began.
Sources
Spence, Lewis An Encyclopaedia of Occultism republished 2006 Cosimo, Inc.