What by birth is the woman who was to get married to Prince Charles known by?
Juan de Mendoza, Marquis de la Hinojosa: Juan de Mendoza y Velasco, Marquis de la Hinojosa, Governor of the Duchy of Milan, 1612–1616, Viceroy of Navarre, 1620–1623, Spanish Ambassador in England in 1623 to discuss with the regnant father of the later king Charles I of England the requirements to be, eventually, met by the English politicians to get Prince Charles married to Maria of Austria, sister of the then 19 years old ruling king Philip IV of Spain. Maria Anna of Spain: Maria Anna of Spain (18 August 1606 – 13 May 1646), was by birth Infanta of Spain and by marriage Holy Roman Empress and Queen of Hungary and Bohemia as the wife of Ferdinand III, Holy Roman Emperor.
Infanta of Spain