John De St. John
He died in 1301.

 Alice Fitzpiers
Alice was born in 1240.  She died after 1305.

 Agnes De St. John
Agnes De was born in 1270 in England.  She died at the age of 75 on June 11th, 1345 in Cowick, England.

 John St. John
John was born in October 1273 in Bassing, Hampshire, England.  He died at the age of 55 on May 14th, 1329.