Thomas Clement Thompson: A Pioneer of Luminism and Irish Portraiture Thomas Clement Thompson (1780 – 1857) stands as a pivotal figure in the annals of Irish art history, recognized primarily for his contribution to Luminist painting—a movement that championed atmospheric landscapes imbued with subtle tonal gradations—and for his prolific output of portrait miniatures capturing the likenesses of prominent individuals. Born in Belfast, Thompson’s artistic journey began amidst the burgeoning intellectual fervor of the Georgian era, shaping him into a master craftsman and a respected member of t…