Thomas Peverell
Thomas was born about 1340.  He died in 1422.

 Margaret de Courtenay
Margaret was born after 1337.  She died on December 8th, 1422.

 Katherine Peverell
Katherine was born in Park, Hamatethy, Penhale, Cornwall, England.  She died after June 14th, 1426 in Salisbury, Wiltshire, England.  She was buried in Salisbury Cathedral, Wiltshire, England.