Louis Hercule Timoléon de Cossé, 8th Duke of Brissac

Louis Hercule Timoléon de Cossé, 8th Duke of Brissac (14 February 1734 – 9 September 1792), was a French military commander and peer of France.

On 29 May 1792, the Assembly dissolved this corps, suspecting it of royalist and counter-revolutionary sympathies and accusing the Duke of Brissac of encouraging this and writing a speech ordering his men to go over to the king.

His head was thrust on a pike and taken on foot by a band of his killers and thrown into a window of Madame du Barry's apartment, at which sight she fainted.

He is mentioned in the fifth verse of Jacques Delille's poem la Pitié, and anecdotes about him are to be found in Paris, Versailles et les provinces.

Together, they had two children: After the death of Louis Hercule in 1792 without a living male-line descendant, the ducal title passed to Timoléon de Cossé (1775–1848).