Simon de Castilla, son of Fernando III of Castile and his second wife Jeanne de Ponthieu, was born around 1244 and died young[1]. He was buried in Toledo.
Sources
↑ Cawley, Charles. Medieval Lands: A Prosopography of Medieval European Noble and Royal Families. Kings of Castile & Leon, chap. 4A Kings of Castile and Leon 1217-1369 Fernando III. Online at for Medieval Genealogy Website (accessed 2017).
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Castile-207 and Castile-221 are not ready to be merged because: Need to be sure these are not two different sons. Based on DOB and DOD of Castile-221 maybe a child who died young.