Letters of recommendation were a staple of the Renaissance, and indeed of the early modern period as a whole: they were used, for instance, in the spheres of cultural and political patronage, international diplomacy, and within confessional groups during the Reformation. But while historians have demonstrated a growing interest in the role such letters could play, especially within patronage networks, only limited attention has been given to the character of the letters themselves; there has been even less concern with the humanist models on which their writers might draw. 1 This is in marked contrast to the ancient period, where letters of recommendation, both real and literary, have been the subject of several studies. 2 My aim is to fill this lacuna by framing a discussion around the letters of recommendation written by Petrarch (Francesco Petrarca), the figure who exerted the greatest influence on Renaissance letter-writing as a whole. 3 It draws particular attention to the dynamics between the letter writer, the recipient, and the person recommended, as reflected in the letters; it also examines the rhetorical strategies that were deployed. As we will see, friendship played a critical role in shaping the context, and determining the content, of these exchanges. 4 Moreover, I 1 Letters of recommendation within Renaissance patronage relationships are discussed for instance in Dale Kent, The