Samuel Cooper (1609–1672) was a nephew and student of the elder Hoskins, and is considered the greatest English portrait miniaturist. He spent much of his time in Paris and Holland, and very little is known of his career. His work has a superb breadth and dignity, and has been well called life-size work in little. His portraits of the men of the Puritan epoch are remarkable for their truth to life and strength of handling. He painted upon card, chicken skin and vellum, and on two occasions upon thin pieces of mutton bone. The use of ivory was not introduced until long after his time. His work is frequently signed with his initials, generally in gold, and very often with the addition of the date.