Friedrich I Guelph
Friedrich I was born about 1357.  He died  due to Murdered. in 1400.

 Anna Von Sachsen-Wittenberg
Anna Von was born about 1370.  She died in 1440.

 Anna Guelph
Anna was born in 1390 in Brunswick, Austria.  She died at the age of 42 on August 10th, 1432 in Innsbruck.

 Katharina Guelph
Katharina was born about 1395.  She died in 1439.