Sir Unknown de Clare
Sir Unknown was born about 1180.  He died on October 25th, 1230.

 Isabel Marshall
Isabel was born about 1202.  She died on January 15th, 1240.

 Sir Richard  IV de Clare
Sir Richard  IV was born on August 4th, 1222 in Gloucestershire, Eng.  He died at the age of 40 on August 15th, 1262 in poisoned, Woodrich Castle, Cabterbury, Eng.