Several of the old Kalendars exhibit the days on which ‘the months of the Egyptians’ and ‘the months of the Greeks’ begin, with the names of these several months. In some early English Kalendars the Saxon names of the months are also inserted. This feature may have been of use to historical students, but having no bearing on ecclesiastical life in the West it is passed over here without further notice. For a similar reason we do not describe the verses frequently inserted at the various months, with advice as to agricultural operations, blood-letting, rules of health, and the unlucky, or Egyptian days. Occasionally attached to early Kalendars and Martyrologies is to be found the Horologium or Shadow-clock—a set of rules for determining, in a rough way, the hour of the day by measuring one’s own shadow on the ground[138]. The modern Roman Martyrology was preceded towards the close of the fifteenth century and in the sixteenth century by several attempts to provide what was thought to be a more serviceable work than that of Usuard. Among the more remarkable of these are the Martyrology of the Italian mathematician Francesco Maurolico, and that of Pietro Galesini, published first at Milan in the year 1577. The latter work had the effect of making manifest that there was need for the correction of the Roman Martyrology. Gregory XIII appointed a commission to deal with the subject. The result of the labours of the commission was printed in 1584. Further corrections were made by Cardinal Baronius; and the work as revised by him is in substance the modern Roman Martyrology[139]. CHAPTER IX EASTER AND THE MOVEABLE COMMEMORATIONS I. _Paschal Controversies prior to the Council of Nicaea._ The commemoration of the Pascha is the first annual Christian solemnity with which history makes us acquainted. And it will be well that the student should bear in mind that the term ‘Pascha’ was used in early times to signify, more particularly, not Easter (for which it was used in later times), but the day of the Lord’s Crucifixion, more commonly without, and sometimes together with, the succeeding two days, including the day of the Resurrection. But most commonly the word is employed in the earlier literature of the subject to signify the commemoration of the day of the Crucifixion, which was generally held to have corresponded in the history of the Passion to the day upon which the Paschal lamb was sacrificed in the Jewish ritual[140].