I only find a litle of the Duchesse of Medinaceli. Only about her family nothing about her patrimony, I sorry.
The title of Duke of Medinaceli was created in 1479 by the Queen Isabel I the catholic of Castilla.
Victoria Eugenia Fernández de Córdoba y Férnandez de Henestrosa is the 18 Duchesse of Medinaceli. She born in Madrid, 16 apr 1917 to Luis Jesus Maria Férnandez de Córdoba (17th Duke) and Ana María Férnandez de Henestroza.
She married Don Rafael de Medina y Villalonga, 12 jan 1938.
She is six times Duchess, 17 times Countess, 17 times Marqueis and three times Vizondesa.
She have four children:
Ana Luisa de Medina y Férnandez de Córdoba, born 2 may 1940. and married a twice with Max Emanuel zu Hohenlohe-Langenburg (between 3 jun 1961 and may 1982) and with don Jaime de Urzaiz y Férnandez del Castillo (from 29 april 1983). She is the IX Countess od Ofalia and Marqueis od Navahermosa.
She have three son from the first marriage: Marco (1962), Pablo (1963) and Flavia (1964). Only her daughter is married with Jose Luis de Villalonga y Sanz and have three sons: Jose Luis, Rafael and Maximiliano.
Luis de Medina y Fernández de Córdoba, born 1941. He married Maria de las Mercedes Conradi on 1 dec 1985. He is the XVIII Marques of Cogolludo, Duke of Santiesteban del Puerto and Marques of Solera. Have two childreen: Victoria (1986) and Casilda (1989).
Rafael de Medina y Fernández de Córdoba born on 10 aug 1942 and died on 4 aug 2001. He married Natividad Abascal in 14 jul 1977 and they was separated from 1989. He was the XIX Duke of Feria and Maques of Villalba. They have two (handsome and single

) children: Rafael, the XX duke of Feria and Marques of Villalba (1978) and Luis (1980)
Ignacio de Medina y Fernández born 23 feb 1947. Married a twice with Mercedes Maier in 1976 and Maria da Gloria de Orleans and Braganza in october 1985. He is the XIX Duke of Segorbe, Count of Moriana del Rio and Count of Ampurias. From his second marriage has two daughters: Sol Maria de la Blanca (1986) and Ana Luna (1988)