Roger I De Mowbray
Roger I was born in 1218.  He died at the age of 48 in November 1266.

 Maud De Beauchamp
Maud was born in 1229.  She died at the age of 44 in April 1273.

 Roger II De Mowbray
Roger II was born in 1254.  He died at the age of 42 in 1296.