An anonymous work, preserved in a manuscript of the 1st century ce from Egypt, about several medical issues (definition of basic concepts, medical historiography on the causes of disease, physiology of digestion), Anonymus Londiniensis represents a rare example of an autograph from antiquity. An important source for peripatetic doxography and the reception of Hellenistic medicine.The papyrus P. Lit. Lond. 165, now held in the British Library as inv. 137 (P. Brit. Libr. inv. 137), was published first in 1893 by Hermann Diels, who learned of it through Fridericus G. Kenyon’s first notice.1 Diels set immediately to work, with the help of Kenyon, and produced the edition after a very short time. The papyrus, as reconstructed by Kenyon (with some later additions in 1901), is a roll around 3.5 metres long. Thirty-nine columns, almost complete, are preserved: one or two columns are missing at the beginning, as is at least one between columns IX and X. The text breaks off abruptly halfway down col. XXXIX. The handwriting suggests a date around the later part of the 1st century .