William DE SAY
He died in August 1144.

 Beatrice DE MANDEVILLE
Beatrice was born in 1105.  She died at the age of 92 on April 19th, 1197.  She was buried in Walden Abbey.

 William DE SAY
William was born about 1126.¹   He died on August 1st, 1177.¹ 

 Geoffrey DE SAY
He died on May 19th, 1214.