Oh that would be interesting though did t Elisabeth marry philip as part of the peacae that ended the Italian wars?
Yes, it was (Cateau-Cambresis, 1559), but if Elizabeth is already bethroted/married to *James VI at the time (he is 19, she is 14, not impossible), she is no longer available. The only other adult first rank princess is Margaret, sister to Henri II, but she is 35 and Philip II would not want another "barren" wife (even if Margaret still has descendants in the male line and Philip not OTL). Either Philip marry Claude and wait some years to consumate (she is 11) or he chose a third-tier princess (Marie de Bourbon-Saint-Pol) or he accept the idea peace could work without marrying child brides to men old enough to be their fathers.