P.Bon. 5 preserves the only known collection of ancient Latin model letters, accompanied by a Greek translation. This article argues that the Latin is the primary version and dates the composition to before the early third century. Comparisons with other model letter collections, principally ps.-Demetrius’ Epistolary Types and ps.-Libanius’ Epistolary Styles, locate the text within a wider literary genre. A new reconstructed text is provided in the Appendix at the end of this article.