Claude Gelée (more commonly known by his pseudonym Claude Lorraine or Le Lorrain) was born in Champagne in the duchy of Lorraine, from which his pseudonym is derived. He traveled to Rome before he was 20 years old and, with the exception of one trip back to France between 1625 to 1627, he lived his entire adult life in Rome. He studied landscape painting with the Italian painter Agostino Tassi, and he was also influenced by the German painter Adam Elsheimer, whose strong lighting he adapted. Indeed, Claude's particular contribution to the ideal landscape was his masterly treatment of light. To guard against forgeries of his work that began occurring in the 1630s, Claude began compiling his Liber Veritatis ("Book of Truth," British Museum, London) about 1635. In it he sketched drawings of almost all his paintings, creating a record of his work. After 1640 his landscapes became more tranquil, bathed in a warm, even light. Claude died in Rome on November 23, 1682.