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SEN. Senatus.----See MAT. SEN. MAT. PAT. Mater Senatus, Mater Patriae of Julia Domna.
SEN. Senior or Seniori.----This title is frequently read on coins of the Emperors Diocletian and Maximian, to indicate (Spanheim observes), or to explain the cause of their both abdicating the government at a time when the strength of Maximian was still unimpaired.