Bible Encyclopedias
Dominius (2)

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

(or Domnus, in later Gallican documents), equivalent to "saint," the same as the mar of the Chaldaean Christians, was at first a title of the abbot, afterwards of his sub-officials, and in the Middle Ages of monks generally. It has been applied to saints, bishops, and to the pope.