The term 'Artist Who Had a Blue Period' refers to the Spanish artist Pablo Picasso (7 letters). Picasso is widely regarded as one of the most influential artists of the 20th century. He is best known for his Blue Period, which lasted from 1901 to 1904 and was characterized by a somber palette of blues and greens. During this period, Picasso painted some of his most famous works, including The Old Guitarist and La Vie.