William de Ros

• Born in 1200 in Holderness
• Deceased before 1264 in Helmsley

Parents

• Robert de Ros (1170 - 1227), Baron of Helmsley
• Isabella de Dunkeld (1170 - 1240)

Family

• Married with Lucia FitzPiers (1200 - aft. 1266), issuing
  • William