On the mainland, an invasion of even greater significance followed in 1580, when Philip II of Spain proclaimed himself king of Portugal and marched his armies across the border.
The invasion by Philip II of Spain was not significant.
mnli hypothesis: The invasion by Philip II of Spain was not significant. premise: On the mainland, an invasion of even greater significance followed in 1580, when Philip II of Spain proclaimed himself king of Portugal and marched his armies across the border.