Research Notes:

The Nobiliario of Pedro Conde de Barcelos names "D. Fernando, D. Pedro, D. Alonso, D. Enrique, D. Felipe" as the sons of King Alfonso IV and his wife, adding that Alfonso, Enrique and Felipe were childless. The Chronicon Domini Joannis Emmanuelis records the birth in Dec 1285 of “Rex Dns Fernandus, filius Regis Dni Sancii, in Hispali”.

He succeeded in 1295 as FERNANDO IV "el Ajurno" King of Castile and León. During his minority, his mother (as regent on his behalf) played an active part in subduing rebellious factions led by Diego [V] de Haro and Diniz King of Portugal. The Chronicon Domini Joannis Emmanuelis records that “Rex Aragonum” captured “Regnum Murciæ” and invaded Castile in 1297. The Chronicon Domini Joannis Emmanuelis records that the king dismissed “tutoriam Infans Dns Henricus” in Feb 1302. The Chronicon Domini Joannis Emmanuelis records that “Rex Dns Fernandus” besieged Algeciras and captured Gibraltar in Aug 1309. The cartulary of Tulle St Martin records the grant by "don Ferrando…rey de Castella, de Toledo, de Leon, de Gallizia, de Sevilla, de Cordoua, de Murcia, de jahen, del Algarbe et senor de Molona…con la reyna dona Costança mi muger" dated 1304, subscribed by "don Mahomet Abevaçar rey de Granada vassallo del rey, el Infante don Johan tye del rey, el Infante don Peydro hermano del rey, el Infante don Filipe hermano del rey, el Infante don Alfonso de Portogal vassallo del rey".

Betrothed (mid-April 1294) to Blanche de France, daughter of Philippe IV "le Bel" King of France and his wife Juana I Queen of Navarre. Père Anselme names Blanche as daughter of King Philippe IV and says that she was “accordée par contrat passé le mardy avant Pâques fleuries 1294 à Ferdinand Infant de Castille”, adding that she died young and was buried near her father....

Betrothed (end Oct 1294) Marguerite de France, daughter of Philippe IV "le Bel" King of France and his wife Juana I Queen of Navarre. Père Anselme names Marguerite as eldest daughter of King Philippe IV and says that she “fut promise par traité passé avant la fête de la Toussaints 1294 à Ferdinand IV roy de Castille, mais cela n’eut aucun effet”...

The Chronicon Domini Joannis Emmanuelis records the death in Sep 1312 of “Rex Dns Fernandus in Jaen”. The Crónica del Rey Fernando IV records the death in Sep of “el rey don Fernando”. Ayala´s Crónica de Pedro I records that “el Rey Don Ferrando”, father of King Alfonso XI, was buried “en la Iglesia de Santa Maria de Cordoba”. ¹