Yellow fever was a threat in New Orleans and south Louisiana virtually every year, during the warmest months. Among the more prominent victims were: Spanish colonial Governor Manuel Gayoso de Lemos (1799); the first and second wives (d. 1804 and 1809) of territorial Governor William C. C. Claiborne and his young daughter (1804); one of New Orleans' most important early city planners Barthelemy Lafon (1820), architect Benjamin Henry Latrobe and one of his sons (1820, 1817, respectively), who were in New Orleans building the city's first waterworks; Jesse Burton Harrison (1841), a young lawyer and author;[20] Confederate Brig. Gen. Young Marshall Moody (1866); architect James Gallier, Jr.