Firstly, there exists a biographical account in chapter 38 of The Lausiac History of bishop Palladius of Helenopolis (c.420); Palladius was a friend and disciple of Evagrius, and spent about nine years sharing Evagrius's life in the desert. Secondly, there is a chapter on Evagrius in the anonymous Enquiry about the monks of Egypt, which predates Palladius, and is a first-hand account of a voyage taken by seven monks from Palestine in the winter of 394-5 to the principal monastic sites in Egypt. The final three sources are briefer and with more distinct biases: Evagrius features in some of the Apophthegmata literature, as well as in the church histories of Socrates and Sozomen.[1]:11f [full citation needed]