In 1803 Savigny published "Das Recht des Besitzes" (The Law of Possession). Anton Thibaut hailed it as a masterpiece which brought the old uncritical study of Roman law to an end. It quickly obtained a European reputation, and remains a prominent landmark in the history of jurisprudence. In 1804 he married Kunigunde Brentano, sister of Bettina von Arnim and Clemens Brentano the poet. The same year he embarked on an extensive tour through France and south Germany in search of fresh sources of Roman law.