Alphonso as portrayed in an early 14th c. genealogical roll of the kings of England
|Born||24 November 1273|
Bayonne, Gascony, France
|Died||19 August 1284 (aged 10)|
Windsor Castle, Berkshire, England
|Burial||26 August 1284|
|Father||Edward I of England|
|Mother||Eleanor of Castile|
Alphonso was the ninth child of King Edward I of England and his Castilian wife Eleanor. He was born in Bayonne, Gascony, a duchy claimed by his maternal uncle King Alphonso X of Castile until his parents' marriage in 1254. Edward and Eleanor's friendship with the King of Castile was also confirmed when they named their son in his honour, a "remarkable choice" given the name's rarity in England. Queen Eleanor even persuaded her brother to travel to Gascony and serve as godfather at the young prince's baptism.
Alphonso's eldest brother, John, had died in 1271; the death of another older brother, Henry, in 1274, made Alphonso the couple's only son up until the last months of his life. As his parents were often required to travel, Alphonso had a household of his own. Queen Eleanor was nevertheless invested in the upbringing of her son, who even had a Spanish cook.
At the age of ten, Alphonso was engaged to Margaret, daughter of Floris V, Count of Holland. An opulent psalter was being prepared for the marriage when he fell ill and died a few months before the wedding was to take place. The Alphonso Psalter was completed a decade later when his sister Elizabeth married Margaret's brother, John I, Count of Holland, making the pairing of arms again appropriate.
Alphonso's death at Windsor occurred shortly after the birth of his younger brother Edward, who became the oldest surviving male heir of Edward I. Alphonso was interred in The Confessor's Chapel at Westminster Abbey, although the exact location is unknown. His heart, however, was buried at the priory of Blackfriars, London (now destroyed).
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