Salmon discovered that it appeared often in medieval illuminations, especially among the men tormenting Christ in scenes of the crucifixion. The association of saddle nose with men perceived to be so evil they would kill the son of God indicates the artists were thinking of syphilis, which is typically transmitted through sexual intercourse with promiscuous partners, a mortal sin in medieval times. One illuminator goes so far as to show a flagellant with an exposed penis, red at the tip as though infected with a syphilitic sore. Others show the deformed teeth associated with congenital syphilis—Hutchinson's incisors—or the eye deformity ptosis that often appears in victims of the disease. It remains mysterious why the authors of medieval medical treatises so uniformly refrained from describing syphilis or commenting on its existence in the population. Probably many confused it with other diseases such as leprosy (Hansen's Disease) or elephantiasis. The great variety of symptoms of treponematosis, the different ages at which the various diseases appears, and its widely divergent outcomes depending on climate and culture, would have added greatly to the confusion of medical practitioners, as indeed they did right down to the middle of the twentieth century. In addition, evidence indicates that some writers on disease feared the political implications of discussing a condition more fatal to elites than to commoners. Historian Jon Arrizabalaga has investigated this question for Castile with startling results revealing an effort to hide its association with elites. The first written records of an outbreak of syphilis in Europe occurred in 1495 in Naples, Italy, during a French invasion (Italian War of 1494–98). Since it was claimed to have been spread by French troops, it was initially called the "French disease" by the people of Naples. The disease reached London in 1497 and was recorded at St Batholomew's Hospital as infected 10 out of the 20 patients. In 1530, the pastoral name "syphilis" (the name of a character) was first used by the Italian physician and poet Girolamo Fracastoro as the title of his Latin poem in dactylic hexameter Syphilis sive morbus gallicus (Syphilis or The French Disease) describing the ravages of the disease in Italy. In Great Britain it was also called the "Great Pox". In the 16th through 19th centuries, syphilis was one of the largest public health burdens in prevalence, symptoms, and disability, although records of its true prevalence were generally not kept because