He received land in 1325 and 1326 in Milmess, England from his father-in-law, so I am assuming he was born before 1305. I am not sure if this is an accurate assumption for this time period. Milmess is no longer on the map in England. 2
Robert married Alice KNIGHTLY  [MRIN: 4757], daughter of Roger DE KNIGHTLY  and Sibell . (Alice KNIGHTLY  died after 1325.)
Glenn, Thomas Allen, Welsh Founders of PA (with parts transcribed and forwarded by Charlotte Coats, well sourced).
Cresson, Osborn Coates, Email dated 2001 at firstname.lastname@example.org (This is an excellent summary of the Cotes lineage in England where Cresson has reviewed first hand documents and 10 plus published sources.).