John of Gaunt claimed the title of King of Castile jure uxoris, and insisted that English nobles address him as "my lord of Spain", but was unsuccessful in his attempts to obtain the crown.
John dari Gaunt menuntut gelar Raja Kastilia jure uxoris, dan bersikeras bahwa bangsawan Inggris harus memanggilnya "Tuanku dari Spanyol", tetapi tidak berhasil dalam usahanya untuk mendapatkan mahkota.