Living just a short twenty-minute walk from one another, they developed a very close relationship that lasted a lifetime. Petrarch dedicated a book to his friend, who "treated him as a brother", despite his later status as Cardinal. Among the intimates of Petrarch's old age there seems to be only one name missing in Petrarch's will, which is Philippe's. Their friendship had begun in 1337 when Petrarch moved to Vaucluse. They stayed close friends up until Philippe's death in 1372. The fact that in spite of this undoubtedly very close relationship Petrarch did not include his friend Philippe in his "Last Will and Testament" is explained by the assumption that Petrarch could not think of any bequest suitable to a man of such high status as that of a prince.