Lahti (God of Carnage, 8, The Heidi Chronicles) will portray Queen Eleanor of Aquitaine opposite the previously announced Williams (Follies, Oleanna, "White Collar") as King Henry II.

Robert Moss will stage the production that officially opens June 29 for a run through July 13 on The Fitzpatrick Main Stage.

The cast will also feature Christian Coulson ("Harry Potter and the Chamber of Secrets") as Philip, Tara Franklin (The Puppetmaster of Lodz) as Alais, Tommy Schrider (War Horse) as Geoffrey and CJ Wilson (A Steady Rain, All American) as Richard.

Here's how it is billed: "An epic and humorous tale of political strategy and family dynamics, The Lion In Winter, set during Christmas 1183, tells the story of King Henry II, Queen Eleanor of Aquitaine, and their sons, Richard, Geoffrey and John as they play a deadly game of real life chess; winner takes the throne. Who will come out on top as the ruler of England and the ruler of the family? The Lion in Winter proves just how absurd and lethal family rivalries can be."

Visit BerkshireTheatreGroup.org for tickets and further information.