Born on 4 June 1883,[1] in North Brixton, Ernest was the son of John Gregory Carlos and Anne Chessell (née Buckler).
[2] Around 1904, Carlos set up a studio in the family home at Foxley Road, north Brixton,[3] from where he built up a business painting and copying portraits, often of senior clergymen.
His painting of an unemployed man, Rejected and Dejected (1908), was exhibited at the Royal Academy and reproduced by the Independent Labour Party in some of their election material.
Arriving in the Artois sector of the Western Front early in 1917, Carlos filled several notebooks with pen and watercolour sketches of life in and behind the trenches.
He was killed in action during the Battle of Messines on 14 or 15 June 1917 while his unit was assaulting a German held spoil heap near Zillebeke in Flanders, a feature that became known as "Buff's Bank".