Family: John Byron / Joanna Thies (F4163)
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Male
John Byron
Birth Abt 1207 Death Yes, date unknown Burial Marriage Father Byron Robert | F4162 Group Sheet Mother
Female
Joanna Thies
Birth Abt 1210 Lancastershire, England 
Death Yes, date unknown Burial Father Baldwin Thies | F4200 Group Sheet Mother
Female
+ Margery Byron
Birth Abt 1227 Death Yes, date unknown Burial Spouse John De Assheton | F3834 Marriage