See also

• Alfonso Plantagenet's parents: Edward Plantagenet - King Edward I (1239-1307) and Eleanor of Castilla (1241-1290)
• Alfonso Plantagenet's siblings: Eleanor Plantagenet ( - ), Joan Plantagenet (1265-1265), John Plantagenet (1266-1272), Henry Plantagenet (1268-1274), Julian (Catherine) Plantagenet (1271- ), Joan Plantagenet of Acre ( - ), Isabel Plantagenet (1274- ), Margaret Plantagenet ( - ), Berengaria Plantagenet (1276-bef1279), Mary Plantagenet ( - ), Alice Plantagenet (1279-1291), Elizabeth Plantagenet (1282-1316), Edward Plantagenet - King Edward II (1284-1327), Beatrice Plantagenet (1286- ) and Blanche Plantagenet (1290- )