Matthew McNulty is also joining the cast as Lucien Grimaud, a money lender and vicious criminal who clawed his way out of poverty and neglect.
Both men will go up against the Musketeers and bring chaos and sedition to the monarchy and Paris when the series returns for is third series.
Speaking about his role, Rupert Everett said: “I’m very excited to be joining the cast of The Musketeers for the new series. I love the show and am really looking forward to working with the team.”
Everett and McNulty join returning cast Luke Pasqualino as d’Artagnan, Tom Burke as Athos, Howard Charles as Porthos, Santiago Cabrera as Aramis, Hugo Speer as Captain Treville, Ryan Gage as King Louis, Alexandra Dowling as Queen Anne and Tamla Kari as Constance.
Liam Keelan, Director of Scripted Content for BBC Worldwide said: “With an all-star cast and twists and turns throughout, series three of The Musketeers is shaping up to be a must-see for all its fans around the world.”
