Gasce IV de Poissy
- Born in 1105 in Poissy
- Killed in 1172, at the approximate age of 66 years
Parents
- Gasce de Poissy (1085 - 1149)
- Alix d'Orgeval (1097 - )
Family
- Married in 1140, with Mabille d'Yvetot (1125 - 1182), issuing
- Gasce (1140 - 1160)
- Married with Mabille d'Yvetot (c. 1115 - 1182), issuing
- Gasce V (1152 - 1189)