Suggestions by @mr95

Rosie Graham

as Philippa Marbury in One Good Earl Deserves a Lover (2035)

Phia Saban

as Penelope Marbury in A Rogue By Any Other Name (2033)

Harry Eden

as Michael Lawler, Marquess of Bourne in A Rogue By Any Other Name (2033)

Will Poulter

as Simon Pearson, Duke of Leighton in Eleven Scandals to Start to Win a Duke's Heart (2031)

Ludovica Francesconi

as Juliana Fiori in Eleven Scandals to Start to Win a Duke's Heart (2031)

George Blagden

as Lord Nicholas St. John in Ten Ways to Be Adored When Landing a Lord (2029)

Stephanie Costi

as Lady Isabel Townsend in Ten Ways to Be Adored When Landing a Lord (2029)

George Blagden

as Lord Gabriel St. John, Marquess of Ralston in Nine Rules to Break When Romancing a Rake (2027)

Olivia Morris

as Lady Calpurnia (Callie) Hartwell in Nine Rules to Break When Romancing a Rake (2027)

Jacob Scipio

as Lancelot in Castle of Thorns

Hugo Becker

as Duke Arnaud Pomeroy in Castle of Thorns

Françoise Cadol

as Princess Charlotte Pomeroy (née Valois) in Castle of Thorns

Amélia Lacquemant

as Princess Elisabeth de Valois in Castle of Thorns

Sami Outalbali

as Prince Charles de Valois in Castle of Thorns

Anamaria Vartolomei

as Princess Marie Oldenburg (née Valois) in Castle of Thorns

Suzy Bemba

as Princess Marguerite de Valois (née Bourbon) in Castle of Thorns

Axel Auriant

as Prince Louis de Valois in Castle of Thorns

Zineb Triki

as Queen Madeleine de Valois (née Savoy) in Castle of Thorns

Benoît Maréchal

as King Henri de Valois in Castle of Thorns

Riccardo Frascari

as Cardinal Alessio di Fiorino in Castle of Thorns