Published in 1929 by The John Day Company of New York, Casanova: His Known and Unknown Life represents the seminal biographical study by American novelist, screenwriter, and translator S. Guy Endore. Before earning renown for his gothic classic The Werewolf of Paris, Endore established his scholarly foundation through this exhaustive examination of Giacomo Casanova. Rather than merely recounting sensationalized romantic escapades, Endore interrogated contemporary archival records, letters, and Casanova's own autobiographical writings to reconstruct eighteenth-century European society. The narrative traces the Venetian adventurer's multifaceted trajectory as an occult enthusiast, diplomat, and ultimately castle librarian to Count Waldstein at Dux, framing him within the intellectual crosscurrents of the Enlightenment. This hardcover volume illustrates late 1920s trade binding craftsmanship, featuring crimson buckram cloth boards, a firm sewn text block, and the publisher's colophon device proclaiming 'Arise for it is Day.' Sourced from the personal library of a National Institutes of Health anthropologist in northern Virginia, the 390-page work includes historical plates and architectural views, such as the Castle at Dux. The volume exhibits authentic vintage wear, showing moisture-induced color variation along the cloth cover and gentle, uniform page toning consistent with age while maintaining solid structural integrity. This piece measures approximately 9.5 inches in height, 6.75 inches in width, and 1.5 inches in depth, and weighs 2.1 pounds.