Maruchi Fresno as Isabel of Aragón

António Vilar as Dinis, King of Portugal

Luis Peña as Nuño de Lara

Fernando Rey as Infante Alfonso

José Nieto as Vasco Peres, the alderman

María Martín as Blanca

Juan Espantaleón as Pedro, the priest

Fernando Fernández de Córdoba as Pedro III de Aragón

María Asquerino as Leonor

Virgílio Teixeira as Alfonso Sánchez

Milagros Leal as Doña Betaza

Gabriel Algara as Juan Velho

Barreto Poeira as Álvaro, the squire

Julieta Castelo as Doña María Ximénez

Carmen Sánchez as Doña Constanza

Emilio G. Ruiz as Infante Pedro

Manuel Guitián as Ramiro

Joaquina Almarche as María de Molina

Rafael Luis Calvo as Fernán Ayres

José Prada as Martín Gil

Manrique Gil as Don Juan Manuel

Félix Fernández as Barredo

Joaquín Puyol as

José Franco as Froilas

Luisa España as Isabel as a child

Santiago Rivero as

Julio F. Alymán as

Francisco Hernández as Villafranca

Elvira Real as

Mercedes Castellanos as María (uncredited)

Alfonso de Córdoba as Juan (uncredited)

Fernando Fresno as Físico (uncredited)

José Jaspe as Estevao (uncredited)