A triumphant painting, but a last hurrah. The central figure is Sir Nevile Wilkinson, the last ever Ulster King of Arms & Principal Herald of Ireland, exercising the duties of his office by proclaiming the accession of the new king at Dublin Castle.
The Anglo-Irish Treaty and its legislative acts neglected to make provision for transferring this ancient office to the new Irish Free State, but Sir Nevile carried on regardless for nearly two decades, even issuing two dozen grants of arms on the day before his death in 1940.
After his death, the Oireachtas created the office of the Chief Herald of Ireland to continue the granting of arms, and in some sense the Chief Herald is a spiritual successor to the Ulster King of Arms.