The Only Thing

Eleanor Boardman

Thyra, Princess of Svendborg

Conrad Nagel

Harry Vane, Duke of Chevenix

Edward Connelly

King of Chekia

Arthur Edmund Carewe

Gigberto

Louis Payne

Lord Charles Vane

Vera Lewis

Princess Erek

Carrie Clark Ward

Princess Anne

Constance Wylie

Countess Arline

Dale Fuller

Governess

Ned Sparks

Gibson

Mario Carillo

Prime Minister

David Mir

Kaylkur

Mary Hawes

Thyra's Maid

Michael Pleschkoff

Captain of the Guards

Joan Crawford

Party Guest (uncredited)

Tom Tyler

Party Guest (uncredited)

Jack Conway

Director

Elinor Glyn

Writer