Abolition of the Heretic Burning Edict
The answer is based on the mention of the cancellation of one of the key documents regulating the burning of heretics. In the quotation from source link txt, it is stated: "The Statute of Henry IV 'De haeretico comburendo' ('On the Burning of Heretics') — (editor’s translation note) was abolished in 1677." (source: link txt) Thus, the cancellation of this decree in 1677 became a significant event after which the burning of heretics at the stake ceased. Supporting citation(s): "The Statute of Henry IV 'De haeretico comburendo' ('On the Burning of Heretics') — (editor’s translation note) was abolished in 1677." (source: link txt)