Three Holy Hierarchs Τριών Ιεραρχών,
Τριών Ιεραρχών, The Three Holy Hierarchs, January 30th
A little education from Symi, for everyone today, though this one is mainly for Jenine: According to Greek Law every Sunday of the year is a public holiday. In addition, there are four obligatory, official public holidays: March 25th, Easter Monday, August 15th and December 25th. Two more days, May 1st and October 28th are regulated by law as optional but it is customary for employees to be given the day off. There are, however, more public holidays celebrated in Greece than are announced by the Ministry of Labour each year as either obligatory or optional. The list of these non-fixed National Holidays rarely changes and has not changed in recent decades, giving a total of eleven National Holidays each year.
A public holiday that occurs on a Sunday is not transferred to another date, with the exception of May 1st which is regarded by the locals more as a General strike than a Public Holiday.
In addition to the National Holidays, there are Public Holidays that are not celebrated nationwide, but only by a specific professional group or a local community. For example many municipalities have a patron Saint or a Liberation Day, and on this day it is customary for schools to have a day off.
(That was all from Wikipedia.) January 30th is, in Greece, Τριών Ιεραρχών (The Three Holy Hierarchs). This day commemorates the patron saints of Education; St Basil the Great, St Gregory the Theologian and St John Chrysostom.
“The Three Hierarchs were great men of letters who were not only defenders of Orthodox Christianity, but supporters of Greek learning.” More.
St Basil the Great, father of Eastern Monasticism, Greek doctor of the Church, Father of the Church. Feast Day January 2nd. Click here.
St Gregory Palamas, Archbishop of Thessalonica, the wonderworker. Feast day November 14th. Born in Constantinople in 1296. Click here.
St John Chrysostom. c. 347 to 407, Greek: Ἰωάννης ὁ Χρυσόστομος, Archbishop of Constantinople, was an important Early Church Father. More.
Obviously none of that information was from my memory, so follow the links to learn more. But hopefully that will go a little way to explaining why Monday is a holiday (for the schools at least).