- Jean II Duke Brittany
- Nicholas Plantagenet
Birth - January 1240 - Berkhampstead, Hertfordshire, England Death - January 1240 - Berkhampstead, Hertfordshire, England - Simon VI De Montfort
Birth - 1240 - Near, Brindisi, Apulia, Italy - Pedro II The (Family name unknown)
- Agnes Or Anna, France
- Nicole De Albini or D'aubi
- William De Ferrers [Sir Knight]
Birth - about 1240 - Of, Groby, Leicestershire, England - Anne Le Despenser
Birth - about 1240 - Of, Loughborough, Leicestershire, England - Isabel Beauchamp
Birth - about 1240 - Gloucestershire, England, Eng - Isabel Marshall
- John De Lacey
- Margaret Princess Of England
- Blanche Princess Of France
- Roger Clare
- Lawrence De Cornwall
Birth - about 1241 - Of, Cornwall, Cornwall, England
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