Nielsen Hayden genealogy
Family: John de St. John / Isabel de Courtenay (F12060)
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Male
John de St. John
Birth Between 1272 and 1274 of Basing, Hampshire, England 
Death Bef 4 Apr 1329 Burial Marriage Other Spouse Alice Wallis | F22419 Marriage Father John de St. John | F8177 Group Sheet Mother Agnes Fitz Reynold | F8177 Group Sheet
Female
Isabel de Courtenay
Birth Death Aft 12 Feb 1333 Burial Father Hugh de Courtenay | F8156 Group Sheet Mother Eleanor le Despenser | F8156 Group Sheet
Female
+ Margaret de St. John
Birth Death 19 Nov 1361 Burial Spouse John de Beauchamp | F20108 Marriage
Male
+ Hugh de St. John
Birth 26 May 1310 of Basing, Hampshire, England Death Bef 25 Oct 1335 Burial Spouse Mirabel Wake | F12059 Marriage Bef 16 Sep 1329