After the notable editions of Suetonius by Roth, Preud'homme, Ihm and Ailloud, the De uita Caesarum edited by R.A. Kaster in the Oxford Classical Texts has made available to scholars a critical text which rests on the firm foundations of a thorough exploration of the tradition and the scholarship on the subject. The relationship of the eighteen medieval manuscripts, placed in a time-frame between the ninth century, the age of the oldest copy, Par. Lat. 6115, and the beginning of the thirteenth century, has been extensively and carefully examined and schematized in a complex stemma codicum, which illustrates the network of copying and contamination. Moreover, the editor has revised the dating of the manuscripts, in the light of the most recent studies, and brought order to the sigla assigned to them by previous editors.