Sir Robert Markham
Sir Robert was born about 1322 in West Markham, Nottinghamshire, England.

 Isabelle Caunton
Isabelle was born about 1335 in Caunton, Nottinghamshire, England.  Isabelle is no longer alive.

 Sir John Markham
Sir John was born in 1368 in Sedgebrook, Lincolnshire, England.