Maybery was born in Brecon, Wales, on 4 January 1895, the only son of Aveline Maybery, a solicitor, and his wife Lucy. He was educated locally and at Wellington College, Berkshire, before going on to the Royal Military College at Sandhurst. After his graduation he was commissioned as a second lieutenant in the 21st Lancers on 17 September 1913. At the outbreak of the war he was serving in the North West Frontier Province where he was promoted to lieutenant on 31 October 1914. After being seriously wounded in action at Shabqadar on 15 September 1915, Maybery became bored during his rehabilitation and, unable to sit on a horse, became involved in observing for a unit of the Royal Flying Corps who were based nearby. He was eventually seconded to the RFC, and appointed a flying officer on 10 October 1916, with seniority from 21 August 1916. Later he travelled to Egypt where he trained to be a pilot, being appointed a flying officer on 11 April 1917, and was posted to France to serve in No. 56 Squadron, alongside aces James McCudden, Arthur Rhys Davids and Keith Muspratt. Aggressive and headstrong, Maybery quickly accumulated a high victory tally, accounting for 21 enemy aircraft between 7 Julyand 19 December 1917. He was awarded the Military Cross on 26 September, and on 18 November was appointed a flight commander with the temporary rank of captain. His second Military Cross was awarded on 17 December. Moments after his final victory on 19 December, shooting down an Albatros D.V over Bourlon Wood, Maybery's SE5a was either hit by fire from a mobile anti-aircraft battery, or shot down by Vizefeldwebel Artur Weber of Jasta 5, and crashed near the village of Haynecourt. His wartime tally consisted of 16 destroyed, and five driven down 'out of control'. Maybery was buried in Haynecourt by the Germans, but after the war was re-interred at Flesquieres Hill British Cemetery, Nord, France. A marble plaque dedicated to the memory of Richard Aveline Maybery, can be found in Brecon Cathedral. The plaque includes the prayer:
