Holy Week (Latin: Hebdomas Sancta or Hebdomas Maior, "Greater Week"; Greek: Ἁγία καὶ Μεγάλη Ἑβδομάς, Hagia kai Megale Hebdomas, "Holy and Great Week") in Christianity is the week just before Easter. In the West, it is also the last week of Lent, and includes Palm Sunday, Holy Wednesday (Spy Wednesday), Maundy Thursday (Holy Thursday), Good Friday (Holy Friday), and Holy Saturday. It does not include Easter Sunday, although traditions observing the Easter Triduum may overlap or displace part of Holy Week or Easter itself within that additional liturgical period.
Holy Week in the Christian year is the week immediately before Easter. The earliest allusion to the custom of marking this week as a whole with special observances is to be found in the Apostolical Constitutions (v. 18, 19), dating from the latter half of the 3rd century and 4th century. In this text, abstinence from flesh is commanded for all the days, while for the Friday and Saturday an absolute fast is commanded. Dionysius Alexandrinus in his canonical epistle (AD 260), refers to the 91 fasting days implying that the observance of them had already become an established usage in his time.
There is some doubt about the genuineness of an ordinance attributed to Roman Emperor Constantine, in which abstinence from public business was enforced for the seven days immediately preceding Easter Sunday, and also for the seven which followed it. The Codex Theodosianus, however, is explicit in ordering that all actions at law should cease, and the doors of all courts of law be closed during those 15 days (1. ii. tit. viii.).