The 120 Days of Sodom was expected to go for up to €6 million on Wednesday, while Breton's seminal manifestos on modern art were estimated at around €4 million.
Sade scrawled the controversial work on a 39-foot scroll smuggled into his Bastille prison cell in 1785. It recounts the story of four wealthy male libertines who lock themselves in a secluded French castle with 46 victims, including girls and boys as young as 12.
The book is a catalogue of 600 types of perversion from orgies to humiliation, torture, rape, bestiality and murder.
When the Bastille was stormed in the 1789 Revolution, Sade wrote that he had “wept tears of blood” over its loss. In fact, the parchment was later recovered from a crack in the cell wall.