From “The Liturgical Year” By Dom Gueranger
In the early ages of Christianity, fasting included also abstinence from wine, as we learn from St. Cyril of Jerusalem, St. Basil, St. John Chrysostom, Theophilus of Alexandria, and others. In the west, this custom soon fell into disuse. The eastern Christians kept it up much longer, but even with them it has ceased to be considered as obligatory. Lastly, fasting includes the depriving ourselves of some portion of our ordinary food, inasmuch as it allows only one meal during the day. Though the modifications introduced from age to age in the discipline of Lent are very numerous, yet the points we have here mentioned belong to the very essence of fasting, as is evident from the universal practice of the Church. It was the custom with the Jews, in the old Law, not to take the one meal, allowed on fasting days, till sunset. The Christian Church adopted the same custom. It was scrupulously practices, for many centuries, even in our western countries. But about the ninth century some relaxation began to be introduced in the Latin Church. Thus we have a capitularium of Theodulph, bishop of Orleans, who lived at that period, protesting against the practice, which some had, of taking their repast at the hour of None, that is to say, about three o'clock in the afternoon.The relaxation, however, gradually spread; for, in the tenth century, we find the celebrated Ratherius, bishop of Verona, acknowledging that the faithful had permission to break their fast at the hour of None. We meet with a sort of reclamation made as late as the eleventh century, by a Council held at Rouen, which forbids the faithful to take their repast before Vespers shall have been begun in the church, at the end of None; but this shows us that the custom had already begun of anticipating the hour of Vespers, in order that the faithful might take their meal earlier in the day. Up to within a short period before this time, it had been the custom not to celebrate Mass, on days of fasting, until the Office of None had been sung, which was about three o'clock in the afternoon; and, also, not to sing Vespers till sunset.
In the early ages of Christianity, fasting included also abstinence from wine, as we learn from St. Cyril of Jerusalem, St. Basil, St. John Chrysostom, Theophilus of Alexandria, and others. In the west, this custom soon fell into disuse. The eastern Christians kept it up much longer, but even with them it has ceased to be considered as obligatory. Lastly, fasting includes the depriving ourselves of some portion of our ordinary food, inasmuch as it allows only one meal during the day. Though the modifications introduced from age to age in the discipline of Lent are very numerous, yet the points we have here mentioned belong to the very essence of fasting, as is evident from the universal practice of the Church. It was the custom with the Jews, in the old Law, not to take the one meal, allowed on fasting days, till sunset. The Christian Church adopted the same custom. It was scrupulously practices, for many centuries, even in our western countries. But about the ninth century some relaxation began to be introduced in the Latin Church. Thus we have a capitularium of Theodulph, bishop of Orleans, who lived at that period, protesting against the practice, which some had, of taking their repast at the hour of None, that is to say, about three o'clock in the afternoon.The relaxation, however, gradually spread; for, in the tenth century, we find the celebrated Ratherius, bishop of Verona, acknowledging that the faithful had permission to break their fast at the hour of None. We meet with a sort of reclamation made as late as the eleventh century, by a Council held at Rouen, which forbids the faithful to take their repast before Vespers shall have been begun in the church, at the end of None; but this shows us that the custom had already begun of anticipating the hour of Vespers, in order that the faithful might take their meal earlier in the day. Up to within a short period before this time, it had been the custom not to celebrate Mass, on days of fasting, until the Office of None had been sung, which was about three o'clock in the afternoon; and, also, not to sing Vespers till sunset.