- Writer:
- Robert H. Webber
- Writer:
- Guy Elmes
- Producer:
- Michael Barry
- Assisted by:
- Basil Adams
- Production designer:
- Barry Learoyd
- Incidental Music:
- James Hartley
- Duke Ludovico Sforza, tyrant of Milan:
- Ballard Berkeley
- Leonardo da Vinci:
- Mark Dignam
- Lucrezia Crevelli, a mistress of the Duke:
- Sonia Holm
- Cecilia Gallerani:
- Rosamund Greenwood
- Bellincioni, a court poet:
- Harold Young
- The Duchess of Mantua:
- Elsa Palmer
- Duchess Maria Fortunato Gonzaga, her daughter:
- Sheila Shand Gibbs
- Gian Donato, a young Genoese:
- Andrew Osborn
- Father Angelo:
- Stanley Drewitt
- Andrea Salai, da Vinci's servant:
- Victor Baring
- Mario D'Oggionno:
- John Benson
- Ambrogio Preda/City Councillor:
- Richard Hurndall
- Giovanni Antonio Boltraffio:
- John Garley
- City Councillor:
- John Garley
- Vicomte de Tassigny, a French officer:
- Hugh Latimer
- Maid-in-Waiting to Maria:
- Maria Brooks
- Tavern keeper/City Councillor:
- Victor Platt
- A Milanese Nobleman:
- William Mervyn
- A priest:
- Leslie Wright
- Other parts played by:
- Patrick Keogh
- Other parts played by:
- Robert Berkeley
- Other parts played by:
- Edna Fryer
- Other parts played by:
- Pamela Skiff
- Other parts played by:
- Musetta Fonnereau
- Other parts played by:
- Marguerite Young
