Philipp I Guelph
Philipp I was born about 1476.  He died on September 4th, 1551.

 Katharina Von Mansfeld
Katharina Von was born on October 1st, 1501.  She died about 1535.

 Ernst III Guelph
Ernst III was born in 1518.  He died at the age of 49 in 1567.