John Doyle, known by the pen name H. B., was an Irish political cartoonist, caricaturist, painter and lithographer.
He was the eldest son of a Dublin silk mercer, and came from a Roman Catholic family which in the 17th century had been granted extensive estates, possibly in County Offaly or County Laois, and their own coat of arms, but had suffered for their religion and since been dispossessed. In his youth he learned to paint landscapes under Gaspare Gabrielli, and miniature portraits at the Royal Dublin Society's drawing school under John Comerford. He won a gold medal in 1805. He was commissioned to paint equestrian portraits of the Marquess of Sligo and Lord Talbot, the Irish viceroy, and in 1822 he produced six prints entitled The Life of a Racehorse. That year he moved to London with his wife, Marianna Conan. His painting Turning out the Stag brought him recognition when it was exhibited at the Royal Academy in 1825.
Marianna died in 1832, giving birth to their seventh child.