The Order of the Illuminati — formally, the Perfectibilists — was founded on 1 May 1776 in Ingolstadt, Bavaria, by Adam Weishaupt (1748–1830), a professor of canon law at the University of Ingolstadt. Weishaupt was a rationalist and reformer, deeply influenced by Enlightenment philosophy and bitterly opposed to what he saw as the reactionary influence of the Jesuit order (which had controlled Bavarian education) and the Catholic Church more broadly.
The order's stated goals were the opposition to superstition, religious influence over public life, and abuses of state power; and the promotion of rationalism, education and moral improvement. Weishaupt modelled its structure on the Jesuit order he despised — a graded system of ranks with the higher grades knowing more about the order's true aims than the lower ones. Members were recruited carefully, often from Freemasonic lodges, and were known to each other only by classical pseudonyms (Weishaupt was Spartacus).
At its peak — around 1784–1785 — the order had somewhere between 650 and 2,500 members across Bavaria, Austria, France, Hungary, Italy and other parts of Europe. Its membership included significant figures: the philosopher Johann Gottfried Herder, the poet and playwright Johann Wolfgang von Goethe (possibly), the diplomat Franz Xaver von Zwackh, and various minor aristocrats and intellectuals.