William Blake was an English poet, painter, and printmaker who lived in the late 18th and early 19th centuries. He is known for his visionary poetry and unique artistic style, which combined romanticism with mysticism. Blake's works often explored themes of spirituality, imagination, and the human experience, and he is considered a major figure in the Romantic movement. His most famous works include "Songs of Innocence and of Experience" and "The Marriage of Heaven and Hell." Blake's art and poetry continue to be influential and celebrated for their originality and depth of expression.