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

 Elizabeth De Cressy
Elizabeth was born in 1378 in Braytoft, Lincolnshire, England.  She died at the age of 30 on September 27th, 1408.

 Sir Robert Markham
Sir Robert was born about 1406 in Sedgebrook, Lincolnshire, England.