ENGELBERT I MARGRAVE de ISTRIA

ENGELBERT I MARGRAVE's father was SIEGFRIED COUNT von SPONHEIM and his mother was RICHARDIS von INNGAU.  His paternal grandfather was EBERHARD von SPONHEIM; his maternal grandparents were ENGELBERT IV COUNT von INNGAU and LIUTGARD von BAVARIA.  He was an only child.  He died in 1095.¹ 

They had a son named SIEGFRIED I.