Petrarch recounts that on April 26, 1336, with his brother and two servants, he climbed to the top of Mont Ventoux (, a feat which he undertook for recreation rather than necessity. The exploit is described in a celebrated letter addressed to his friend and confessor, the monk Dionigi di Borgo San Sepolcro, composed some time after the fact. In it, Petrarch claimed to have been inspired by Philip V of Macedon's ascent of Mount Haemo and that an aged peasant had told him that nobody had ascended Ventoux before or after himself, 50 years before, and warned him against attempting to do so. The nineteenth-century Swiss historian Jacob Burckhardt noted that Jean Buridan had climbed the same mountain a few years before, and ascents accomplished during the Middle Ages have been recorded, including that of Anno II, Archbishop of Cologne.