Manchego War (Sacred Accord)

The Manchego War, ironically nicknamed the Autoconquista ('Self-Conquest') at the time after the belief that war between Spaniards was regressive and that the Reconquista should be prioritised, was a military conflict of the late 15th Century revolving around the region of La Mancha and involving the alliances of the Crown of Aragon and the Crown of Castile. Relations between the two nations had decisively soured over the preceding few decades following disputes over the Kingdom of Navarre and which crown it would inevitably be integrated into; the question was answered during this war when Navarre was inaugurated as a kingdom of the Castilian Crown. Such negative relations came to a head in December 1460 when Aragonese King XXX learned of the commencement of the integration process of the recently-vassalised Navarrese realm into Castile. He declared war on Castile on 9 December and marched into the region of La Mancha, lending the war its name.