Dietrich Von Oldenburg
Dietrich was born about 1390.

 Hedwig Von Holstein
Hedwig was born about 1400.  She died in 1436.

 I Christian
I was born on May 21st, 1425 in Kobenhavn, Kobenhavn, Denmark.  He died at the age of 56 in 1481.

 Gerhard Von Oldenburg