When Saint Chrysostom's Prayer asks that the petitions of the Lord's servants be fulfilled as may be most expedient for them, it expresses what, in traditional autocracies, was expected of every ‘good king’ by his subjects. St. Louis, the model of a medieval king, would go regularly with his courtiers to the Bois de Vincennes, there to hear his subjects' petitions, seated under an oak. Dr. Millar has pointed out that Roman emperors were expected to be accessible to their subjects, especially those of humble station, in much the same way. The evidence shows that much of the emperors' time was taken up with answering petitions (in the form of libelli) from private individuals or from groups of humbler people, and that it was only ‘bad’, lazy emperors who neglected this task. Not only was there a secretarial department for handling petitions, as distinct from epistles, but its head, the a libellis, was, according to Seneca, deluged with work. Literary sources, however, tell us little or nothing of value about the actual methods of accepting and handling petitions. For information on such topics we have to turn to the surviving texts of the ‘subscripts’ (subscripttones), the imperial replies to petitions (very few actual petitions survive). By far the largest number of these from the period of the Principate is to be found in the Code of Justinian, and they are mainly the work of the Severan and later third century emperors. In the process of transmission many of these texts have been abbreviated, and the formal elements have been omitted or garbled as a result, and it is from these formal elements that most can be learned about the procedures for handling petitions. One is therefore thrown back on the epigraphic and papyrus texts, in which these formal elements are often preserved.