Isabella Clara Eugenia was sovereign of the Spanish Netherlands in the Low Countries and the north of modern France, together with her husband Albert. In some sources, she is referred to as Clara Isabella Eugenia. By birth, she was an infanta of Spain and Portugal.
Isabella Clara Eugenia of Austria was born in the city of Segovia on 12160August 1566, daughter of Philip II of Spain and his third wife Elisabeth of Valois. Her paternal grandparents were Emperor Charles V and Isabella of Portugal. Her maternal grandparents were Henry II of France and Catherine de Medici.
Source: Wikipedia