 Maruchi FresnoIsabel of Aragón | Isabel of Aragón |
 António VilarDinis, King of Portugal | Dinis, King of Portugal |
 Luis PeñaNuño de Lara | Nuño de Lara |
 Fernando ReyInfante Alfonso | Infante Alfonso |
 José NietoVasco Peres, the alderman | Vasco Peres, the alderman |
 María MartínBlanca | Blanca |
 Juan EspantaleónPedro, the priest | Pedro, the priest |
 Fernando Fernández de CórdobaPedro III de Aragón | Pedro III de Aragón |
 María AsquerinoLeonor | Leonor |
 Virgílio TeixeiraAlfonso Sánchez | Alfonso Sánchez |
 Milagros LealDoña Betaza | Doña Betaza |
 Gabriel AlgaraJuan Velho | Juan Velho |
 Barreto PoeiraÁlvaro, the squire | Álvaro, the squire |
| JJulieta CasteloDoña María Ximénez | Doña María Ximénez |
 Carmen SánchezDoña Constanza | Doña Constanza |
| EEmilio G. RuizInfante Pedro | Infante Pedro |
 Manuel GuitiánRamiro | Ramiro |
| JJoaquina AlmarcheMaría de Molina | María de Molina |
 Rafael Luis CalvoFernán Ayres | Fernán Ayres |
 José PradaMartín Gil | Martín Gil |
| MManrique GilDon Juan Manuel | Don Juan Manuel |
 Félix FernándezBarredo | Barredo |
| JJoaquín PuyolNot listed | Not listed |
 José FrancoFroilas | Froilas |
| LLuisa EspañaIsabel as a child | Isabel as a child |
 Santiago RiveroNot listed | Not listed |
 Julio F. AlymánNot listed | Not listed |
| FFrancisco HernándezVillafranca | Villafranca |
| EElvira RealNot listed | Not listed |
 Mercedes CastellanosMaría (uncredited) | María (uncredited) |