Todos os Santos (All Saints)

The Sunday following Pentecost is dedicated to All Saints, both those who are known to us, and those who are known only to God. There have been saints at all times, and they have come from every corner of the earth. They were Apostles, Martyrs, Prophets, Hierarchs, Monastics, and Righteous, yet all were perfected by the same Holy Spirit.
St Peter of Damascus, in his "Fourth Stage of Contemplation," mentions five categories of saints: Apostles, Martyrs, Prophets, Hierarchs, and Monastic Saints (PHILOKALIA [in English] Vol. 3, p.131). He is actually quoting from the OCTOECHOS, Tone 2 for Saturday Matins, kathisma after the first stichology.

St Nicodemus of the Holy Mountain (July 14) adds the Righteous to St Peter's five categories. The list of StNicodemus is found in his book THE FOURTEEN EPISTLES OF ST PAUL (Venice, 1819, p. 384) in his discussion of I Corinthians 12:28.

The hymnology for the feast of All Saints also lists six categories: "Rejoice, assembly of the Apostles, Prophets of the Lord, loyal choirs of the Martyrs, divine Hierarchs, Monastic Fathers, and the Righteous…."

Some of the saints are described as Confessors, a category which does not appear in the above lists. Since they are similar in spirit to the martyrs, they are regarded as belonging to the category of Martyrs. They were not put to death as the Martyrs were, but they boldly confessed Christ and came close to being executed for their faith. St Maximus the Confessor (January 21) is such a saint.

http://ocafs.oca.org/FeastSaintsViewer.asp?FSM=6&FSD=3