Question: Who is the paternal grandfather of Philip Iv Of Spain?
Sentence (from "Philip III of Spain"): Nonetheless, as the ruler of the Spanish Empire at its height and as the king who achieved a temporary peace with the Dutch (1609–1621) and brought Spain into the Thirty Years' War (1618–1648) through an (initially) extremely successful campaign, Philip's reign remains a critical period in Spanish history.
Relevant evidence: No