Constantia Habsburg by ? (location unknown to gogm)
This portrait of Constantina Habsburg shows the Habsburgs wore sayas wherever they were - most of Catholic Europe. She lived between 1588-1631 and was the daughter of Karl II. She married Sigismund of Poland. The image is on the Web, but there is no provenance information. It looks like a painting by Sofonisba Anguissola, court painter to the Habsburg court in Spain. Her Wikipedia article is here.