John III (; 1469 – 14 June 1516) was jure uxoris King of Navarre from 1484 until his death, as husband and co-ruler with Queen Catherine. He was a son of Alain I, Lord of Albret and his wife Frances, Countess of Périgord. King of Navarre Marriage to Queen Catherine and accession to the throne He became King of Navarre and Count of Foix by virtue of his 1484 marriage to Queen Catherine (1470–1517), successor of her brother Francis Phoebus in 1483. He shared with Catherine tasks related to the government of the kingdom, but his rule was marked by the guardianship of Catherine's mother Magdalena de Valois up to 1494—she died in 1495—and persistent diplomatic and military pressure of Ferdinand II of Aragon over the Crown of Navarre, supported on the ground by the Beaumont party of Navarre. He and Catherine were crowned as monarchs in Pamplona on 10 January 1494. In the run-up to the ceremony, Louis of Beaumont—count of Lerín—had taken over and ransacked the stronghold. On Christmas 1493, the count blocked the access of the king and queen to the capital city, but after a fleeting peace agreement was reached, the ceremony was held. In the week-long festival following the crowning ceremony, John III and his father are referred to in Basque language verses as Labrit, their usual naming in Navarre—also at Olite in 1493, document written in Romanic language. The kingdom invaded In 1512, Navarre was invaded by a combined Castilian-Aragonese army sent by Ferdinand II of Aragon, whose second wife was Germaine de Foix (1490–1538), a cousin of Queen Catherine. The Castilian troops commanded by the duke of Alba crossed the Pyrénées onto Lower Navarre capturing St-Jean-Pied-de-Port on 10 September 1512 and wreaking havoc across much of the merindad. There the Castilians were doggedly opposed by lords loyal to John III and Catherine of Navarre, but the Castilians retained St-Jean-Pied-de-Port and its hinterland. Following the invasion, Navarre south of the Pyrenees was annexed to Castile nominally as an autonomous kingdom (aeque principalis) by the victorious Ferdinand after taking an oath to respect the Navarrese laws and institutions (1515). The royal family took shelter in Béarn, a royal Pyrenean domain and principality contiguous to Lower Navarre. The Parliament of Navarre and the States-General of Béarn had passed in 1510 a bill to create a confederation with a view to ensuring a better defence against external