Kollyvades

The Kollyvades () were the members of a movement within the Eastern Orthodox Church that began in the second half of the eighteenth century among the monastic community of Mount Athos, which was concerned with the restoration of traditional practices and opposition to unwarranted innovations, and which turned unexpectedly into a movement of spiritual regeneration. As Bishop Kallistos of Diokleia succinctly points out:
The movement derived its name from the Kollyva (boiled wheat) which is used during memorial services. Its proponents were Athonite monks who adhered strictly to Holy Tradition, and insisted that memorial services should not be performed on Sundays, because that is the day of the Lord's Resurrection, but rather on Saturday, the usual day for the commemoration of the dead. They were also in favor of frequent reception of Holy Communion, and practiced unceasing prayer of the heart.
The terms "“Kollyvades”", "“Kollyvistai”", and "“Sabbatianoi”" were epithets which were originally meant sarcastically as bitter insults, however over the passage of time these contemptuous appellations became a title or badge of honor. The leaders of the movement were Neophytos Kafsokalyvitis (1713-1784), Saint Makarios (Notaras) of Corinth (1731-1805), Saint Nicodemus of the Holy Mountain (1749-1809), and Saint Athanasios Parios (1722-1813).
History.
Commemorations of the dead.
The movement arose in 1754 out of a dispute within the Skete of St. Anne at Mount Athos when a group of monks objected to the scheduling of the commemoration of the dead on Sunday, the day that represented the Resurrection and Christ's victory over death, instead of Saturday or weekdays as it had been according to ancient custom. Other monks held that the commemoration of the dead has a Resurrection theme in every Liturgical celebration. While much animosity developed between the groups, the movement of the Kollyvades, as they became known, became part of an attempt to address deficiencies in spiritual life that had arisen in the Church since Byzantine times.
The first response from Constantinople to the issue of Sunday commemorations of the dead came in the form of a letter from Patriarch Theodosios II in 1772, wherein he stated that those who performed Saturday memorials did so appropriately in conformity with ancient tradition, whereas those who performed them on Sundays "“ouch hypokeintai krimati”" (do not sin). 
This attempt at reconciliation having failed, the Patriarch’s successor, Samuel I Chatzeres (1773–1774), issued a Synodal Encyclical (1773) directing all monastics to adhere to the policies enacted by their monasteries and avoid strife over the issue of commemorations. Once more, this tactic, also in the spirit of compromise and aimed at a reconciliation of the two factions, failed.
Therefore, a Synod was convened in 1774 at the Koutloumousiou Monastery, on Mount Athos, at the order of the Oecumenical Patriarch. It was composed of two former Patriarchs of Constantinople, four retired Metropolitans, two active Metropolitans, and two Bishops from Thessaloniki. There were also about two hundred monks present at the convocation. The Synod declared that all of those who did not accept the Synodal Encyclical of 1773 were subject to anathema. Despite this determination, the controversy went on.
Thus, in 1776, yet another Synod was convened in Constantinople, under Patriarch Sophronios II, at which the Patriarch of Jerusalem and sixteen other hierarchs were also present. It was declared by the participants that memorial services could be celebrated on either Saturday or Sunday, and that the issue was not to be discussed further. It was at this Synod that St. Athanasios Parios, Neophytos Kavsokalyvites, and St. Nikodemos the Hagiorite, among others, were excommunicated. These individuals were of course subsequently vindicated.
Frequent communion.
In addition to the issue of following proper ritualistic traditions, there was a concern for return to a Eucharistic-centered spirituality and to the precepts preached by the Hesychasts of the fourteenth century. The Kollyvades movement strove for a rediscovery of Patristic theology and a liturgical life that included frequent communion. The movement came under assault by many at Mount Athos and elsewhere, attacks that became, at times, vicious and beyond what one would expect from monastics and clergy of any rank.
In 1819 a Council at Constantinople endorsed the views of the Kollyvades fathers that Holy Communion should be partaken of regularly by clergy and faithful alike.