She was the fourth and final wife of Felipe II.
Her Wikipedia article is here.

1571 Anne of Austria, Queen of Spain by Alonso Sánchez Coello (Museo Lázaro Galdiano - Madrid Spain)

1575 Ana de Austria, reina de las Españas, reina de Portugal by Sofonisba Anguissola (Museo Nacional del Prado - Madrid, Spain)

1616 copy of 1570 original Ana de Austria by Bartolomé González y Serrano (Prado) carcanet-style necklace with Habsburg double eable
