Maria Theresa- one side of her family, the Mestras, are descended from Ferdinand the Great of Leon and Castile.
From her mother's side,she is also a descendant of King Alfonso IV of Aragon:
King Alfonso IV of Aragon,lived from 1299-1336
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Count Jaime de Aragon of Urgel,lived from 1321-1347
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Doña N,batarde de Aragon
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Don Jaime de Tores y Aragon,Senor de Zayas,born in 1360
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Don Alonso de Zayas y Muñiz de Godoy,born around 1380
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Don Alonso de Zayas Saavedra,Señor de la villa de Coria
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Don Luis de Zayas y Méndez de Biedma
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Don Lope de Zayas y Manrique
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Don Cristóbal de Zayas y de la Puebla,Regidor de Antequera,born in 1540
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Don Lope de Zayas-Bazán,born in 1565
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Doña Maria de Zayas-Bazán y Roxas
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Doña Maria de Barreda y Zayas-Bazán,died around 1718
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Doña Mariana Rosa de Velasco Miranda y Barreda
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Don Agustin de Zayas-Bazán y Velasco,died in 1766
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Don Agustin de Zayas-Bazán y Vergara,died in 1779
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Don José Zayas-Bazán y Sanchez-Pereira
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Doña Agueda de Zayas-Bazán y Aguëro,born in 1725
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Francisco Xavier Batista y Zayas-Bazán
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Melchior Batista y Caballero,lived from 1813-1890
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Melchior Batista y de Varona,lived from 1859-1932
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Agustin Batista y González de Mendoza,lived from 1899-1968
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Maria Teresa Batista y Falla,lived from 1928-1988
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Grand Duchess Maria Teresa of Luxembourg,born in 1956