ALL SAINTS, FESTIVAL OF (ALL HALLOWS, HALLOW MASS), a feast of the Church celebrated on Nov. in honour of all saints, known or unknown, as a festival of the first rank, with vigil and octave. The first trace of a general commemoration of martyrs is in Antioch on the Sunday after Pentecost ; Chrysostom (d. 4o7) also refers to the custom. At Rome the feast of St. Mary ad Martyres was instituted on May 13, 6o9 or 61o, when Boniface IV. dedicated the Pantheon to the Blessed Virgin and all martyrs. Gregory III. (731-741) dedicated an oratory in St. Peter's to all saints, and fixed the anniversary for Nov. 1. This observance was extended by Gregory IV. (827-844) to the whole Church; the octave was added by Sixtus IV. (1471-84). At the Reformation the festival was retained in the calendars of the Church of England and many of the Lutheran Churches; in the latter, however, it has fallen into complete disuse.