• Was a British wood-engraver and painter.
• Clennell was born in Ulgham near Morpeth, Northumberland.
• The son of a farmer.
• He was apprenticed to the Newcastle upon Tyne wood-engraver Thomas Bewick in 1797.
• After completing his seven-year apprenticeship with Bewick he moved to London in 1804.
• He married a daughter of the copper-engraver Charles Turner Warren.
• He gained a reputation as a wood-engraver, and in May 1806 he was awarded the gold palette of the Royal Society of Arts for a wood-engraving of a battle scene.
• He subsequently gave up engraving for painting.
• In 1814, he received from the Earl of Bridgewater a commission for a large commemorative picture, Banquet for the Allied Sovereigns, at the Guildhall, London.
• He experienced great difficulty in getting the more than 400 distinguished guests to sit for their portraits, suffered a mental breakdown, and spent some time in a mental asylum in Salisbury.