A great martyr (also spelled greatmartyr or great-martyr) or megalomartyr (from Byzantine Greek μεγαλομάρτυς, megalomártus, from μέγας, mégas 'great' + μάρτυς, mártus 'martyr'; Church Slavonic: великомꙋ́ченикъ; Romanian: mare mucenic; Georgian: დიდმოწამე) is a classification of saints who are venerated in the Eastern Orthodox Church and those Eastern Catholic Churches which follow the Rite of Constantinople. The term is also used in Malta especially by parishes dedicated to Saint George in reference to him (San Ġorġ Megalomartri).
Generally speaking, a greatmartyr is a martyr who has undergone excruciating tortures—often performing miracles and converting unbelievers to Christianity in the process—and who has attained widespread veneration throughout the Church. These saints are often from the first centuries of the Church, before the Edict of Milan. This term is normally not applied to saints who could be better described as hieromartyrs (martyred clergy) or protomartyrs (the first martyr in a given region).
List
Anastasia of Sirmium
Apostolos the New
Artemius
Barbara of Nicomedia
Prince Bidzin, Prince Elizbar, and Prince Shalva of Georgia
Catherine of Alexandria
Charalambos
Christina of Bolsena
Demetrius of Thessaloniki
Euphemia
Eustace
George of Lydda
George the New of Sofia (1515)
Gobron
Irene of Macedonia
James of Persia
John the New of Suceava
Ketevan of Mukhrani
Konstanti Kakhi
Kyriaki of Nicomedia
Lazarus of Serbia
Marina the Martyr
Menas of Egypt
Mercurius of Caesarea
Pantaleon of Nicomedia
Paraskevi of Rome
Phanourios the Newly-Revealed
Procopius of Scythopolis
Sabbas the Goth
Theodore Gavra of Atran in Chaldea
Theodore Stratelates
Theodore Tiron
Tryphon of Campsada
Xenia of Peloponnesus