Of course, as stated earlier, the effectiveness of this principle is moderated by the extent to which the other principles have been implemented.
The effectiveness of this principle is reliant upon the degree to which the other principles have been applied.
The army of Juan I of Castile invaded Portugal in 1383, but Joao of Avis, recently proclaimed King Joao I of Portugal, defeated the Spaniards in a decisive battle which was fought in 1385 at Aljubarrota, about 100km (62 miles) north of Lisbon.