Regnier I "Longneck" de Hennegau Count of Hainaut
Regnier I "Longneck" de Hennegau was born about 0850. Regnier I "Longneck" de Hennegau's father was
Giselbert of Maasgau Count of Darnau and his mother is
Helletrude de Lorraine. He was an only child. Regnier I "Longneck" de Hennegau is no longer alive.