Nielsen Hayden genealogy
Descendants of Marie de Roucy
Father: Jean II de Roucy ( - 1251 Flanders)
Mother: Marie de Dammartin
Marie de Roucy
   └─ Alix de Garlande (Between 1296 and 1301 - Bef 1361)
    Dreux de Roye ( - Aft 1334)
       └─ Jeanne De Roye ( - Bef 11 Sep 1376)
        Arnould V de Gavre ( - 1387)
           └─ Arnould VI de Gavre ( - 1 May 1418 bur.Escornaix, now Schoorise, Belgium) =>
            + Isabelle de Ghistelles ( - 1435 bur.Escornaix, now Schoorise, Belgium)(m. Between 1380 and 1390)