Royal Institute of British Architects
Group From 1834
From the RIBA website: "RIBA Awards are given for buildings that have high architectural standards and make a substantial contribution to the local environment. The awards are annual, and have been running continuously since 1966." But there must have been a previous scheme since the Stockleigh Hall memorial shows that RIBA was awarding the London Architecture Medal (with a very similar design) back in 1937. We've searched but can find no on-line list.