Thomas was part of a group of like-minded Welsh sportsmen, based in London, that decide to create their own club.
[4] In 1889 Thomas was first selected to represent Wales in a match against Scotland, as part of the Home Nations Championship.
During the tournament, Thomas switched from London Welsh to Llanelli, and played his final three international matches while representing the South Wales club.
He was seen as considerable all-round sportsman,[3] and was an excellent shot, proficient horseman and keen angler.
During World War I, Thomas served his country as a medical officer in the Welsh Horse Cavalry Regiment, based in Egypt.