Heinrich I Van Cuijck
Heinrich I was born about 1150 in Arnsberg, Westphalia, Prussia.  He died in 1203.

 Ermengard Von Soest
Ermengard was born about 1152 in Arnsberg, Westphalia, Prussia.  She died in 1203.

 Konrad I Von Arnsberg-Rietberg
Konrad I was born about 1206 in Arnsberg, Westphalia, Prussia.

 Adelheid Von Arnsberg
Adelheid was born in Cuijck, Noord-Brabant, Netherlands.  She died after 1200 in Prussia.

 Alverade Von Arnsberg
She died after 1205.