His remarkable drawing skills were apparent from an early age, so that he enjoyed the royal patronage of King George III.
[2][3] In 1803 he accepted the post of drawing-master at the newly established Royal Military College, Sandhurst, a position he held for forty years.
One of his sons, Philip Henry Delamotte (1821–1889), was a noted photographer and illustrator, and became Professor of Drawing and Fine Art at King's College London.
[citation needed] Another son, William Alfred Delamotte junior (1806–1872), was a botanical and scientific illustrator, and lithographer.
[5] William Alfred Delamotte senior died in Oxford at the age of 88 on 13 March 1863 and is buried in St Sepulchre's Cemetery there.