Frederick
Frederick was born on December 26th, 1194.  He died at the age of 55 on December 13th, 1250.

 Isabella Lackland Princess of England
Isabella Lackland Princess of was born in 1214.  She died at the age of 27 on December 1st, 1241.

 Conrad IV of Germany
Conrad IV of was born in 1228.  He died at the age of 26 in 1254.