Isaac de Porthau

Isaac de Porthau (also Portau or Portaut; January 30, 1617, Pau – July 13, 1712) was a Gascon black musketeer of the Maison du Roi in 17th century France. In addition, he was the first cousin once removed of the Comte de Troisville, captain of the Musketeers of the Guard (the captain of the musketeers could only be the king himself), and first cousin of Armand d'Athos. Porthau served as the inspiration for Alexandre Dumas's character "Porthos" in the d'Artagnan Romances.

Life Born in Béarn to Isaac de Porthau de Camptort de Campagne de Castetbon (Secretary of the Parliament of Béarn) and Clémence de Brosser, as the eldest of four children: Jean, Jeanne, and Sarah. Some sources say he was merely a guard while his brother Jean was the black musketeer, and may be in part responsible for the fictional representations of Porthau. He had two sons: Arnaud and Jean.

These arms were granted to the Porthaus on November 24, 1674. It is unrecorded what, if anything, their arms were prior to this date.