Gerolf of Middle Friesland
Gerolf of Middle was born in 0815 in Belgium.  He died after 0839.

 Daughter of Corbic
Daughter of was born in 0825.  Daughter of is no longer alive.

 Gerolf Count of West Friesland
Gerolf Count of West was born about 0845 in of Netherlands.  He died after 0885.