This fact is supported by a remark of St Irenæus, in an official letter addressed to Pope Victor (189-99), on the occasion of the second dispute about Easter. It is given, for the most part, by Eusebius in his history of the Church.[189] This is the earliest evidence for the fast before Easter. It shows that the practice had not yet received a fixed and special form. Some, for instance, thought only one day ought to be kept as a fast, Good Friday; others fasted for two days, Good Friday and Holy Saturday—the two days, as Tertullian says, on which the Bridegroom was taken away. Others again fasted for more than two days (unfortunately, it is not said for how many), and others reckoned as their fast day, forty consecutive hours. That is to say, they kept a continuous fast for forty hours night and day, and regarded this as their fast day.[190] Which these forty hours were is easy to say, for our Lord lay in the grave for about forty hours, from the afternoon of Good Friday until Easter morning, or from Good Friday morning to the evening of Saturday. Irenæus and Tertullian know nothing as yet of the fast of forty days, although in their days it was the universal custom to fast, and that very strictly, on the two last days of Holy Week. About the middle of the third century, a week’s fast was customary in many places—the entire Holy Week being fasted on water and bread and salt, while on the last two days nothing whatever was eaten. The _Didascalia_ describes the fast in the same way, and also the Apostolic Constitutions (5, 15). After this manner, accordingly, the fast was observed in Syria, and Dionysius witnesses to the same practice in Alexandria.[191] However the words, “The fast shall be broken when a Sunday intervenes,”[192] found on the well-known statue of Hippolytus in Rome, show that already, by the middle of the third century, the fast extended over several weeks. The fast here alluded to must have extended over fourteen days at least. The disputed canons of Hippolytus (the twentieth and twenty-second) receive some confirmation from this passage. In the fourth century, many witnesses to the fast of forty days are forthcoming, both writers, such as Eusebius, Cyril of Jerusalem, Ambrose, etc., as well as ecclesiastical enactments, _e.g._, the sixty-ninth of the Apostolic Canons. The Fifth canon of the First Council of Nicæa, in particular, mentions Lent as an observance already established. Nevertheless it clearly was not as yet uniformly observed in all parts of the Church, as the Festal Letters of St Athanasius bear witness.