She later gave birth to Infanta Isabella Clara Eugenia of Spain on 12 August 1566 , and then to Isabella 's younger sister Catherine Michelle of Spain on 10 October 1567 .
Elisabeth 's first pregnancy in 1564 ended with a miscarriage of twin girls .
Elisabeth later gave birth to Infanta Isabella Clara Eugenia of Spain on 12 August 1566 , and then to Isabella 's younger sister Catherine Michelle of Spain on 10 October 1567 .
Elisabeth 's first pregnancy in 1564 ended with a miscarriage of twin girls .