Henry II (1369-1379), as the victor of Montiel was now entitled to be called, did not retain his crown in peace. Despite the fact that he had gravely weakened the monarchy by his grants of lands and privileges in order to gain support, he was beset by those who were still faithful to Pedro, or who at least pretended they were, in order to operate in their own interest. Aragon, Navarre, Portugal, and England waged war on Henry, and the two last-named countries supported Pedro’s illegitimate daughters by María de Padilla, Constanza and Isabel (for Pedro had no legitimate children), in their pretensions to the throne, as against the claims of Henry. The most serious demands were put forward by John of Gaunt, Duke of Lancaster and husband of Constanza, backed by Edward III of England. Henry overcame his difficulties, although at the cost of concessions to the nobles which were to be a serious obstacle to future kings. [Sidenote: Juan I and the battle of Aljubarrota.] [Sidenote: The Prince and Princess of Asturias.] The reign of Juan I (1379-1390) was marked by two important events. Juan married the heiress to the Portuguese throne, and the union of Spain and Portugal seemed about to take place, but this arrangement did not suit the Portuguese nobility. A new king of Portugal was chosen, and the Castilian army was completely defeated at Aljubarrota in 1385. Shortly afterward, the Duke of Lancaster landed in Spain with an English army to prosecute the claims of his wife. This matter was settled by the marriage of the Duke of Lancaster’s daughter, in 1388, to Juan’s heir, Prince Henry. Thus was the conflict of Pedro I and Henry II resolved. Their descendants, though tainted with illegitimacy in both cases, had joined to form the royal family of Spain. The young prince and his consort took the titles of Prince and Princess of Asturias, which have been used ever since by the heirs to the Spanish throne. [Sidenote: Henry “the Sickly.”]