Baron Ralph de Monthermer Earl of Hertford
Ralph was born about 1270 in ,,England.  He died in 1325.¹ 

 Joan Plantagenet Princess of England
Joan Plantagenet Princess of was born in 1272 in Acre,Palestine.²   She died at the age of 35 on April 23rd, 1307 in Clare,Suffolk,England.  She was buried on September 7th, 1265 in Windsor Castle,Berkshire,England.^2 2 

 Mary de Monthermer
Mary was born about 1301 in ,Gloucestershire,England.

 Sir Thomas de Monthermer
Thomas was born on October 4th, 1301 in ,Gloucestershire,England.