{{RomanMilitary
Pia Fidelis, Latin feminine form for "pious and faithful", was the ''
cognomen
A ''cognomen'' (; plural ''cognomina''; from ''con-'' "together with" and ''(g)nomen'' "name") was the third name of a citizen of ancient Rome, under Roman naming conventions. Initially, it was a nickname, but lost that purpose when it became here ...
'' of several Roman legions, awarded by an emperor when the legion had proved "devoted and loyal". Some legions received this honour several times, and their name included the number of awards.
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Legio I ''Adiutrix'' ''Pia Fidelis Bis'' ("twice loyal and faithful")
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I ''Minervia'' ''Pia Fidelis Domitiana'' ("loyal and faithful to
Domitian
Domitian (; la, Domitianus; 24 October 51 – 18 September 96) was a Roman emperor who reigned from 81 to 96. The son of Vespasian and the younger brother of Titus, his two predecessors on the throne, he was the last member of the Flavi ...
")
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II ''Adiutrix''
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III ''Italica'' ''VII Pia VII Fidelis'' ("seven times faithful and loyal")
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V ''Macedonica'' ''VII Pia VII Fidelis''
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VII ''Claudia'' ''VII Pia VII Fidelis'' ("seven times faithful and loyal")
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X ''Gemina'' ''Pia Fidelis Domitiana'' ("faithful and loyal to Domitian")
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XI ''Claudia'' ''Pia VI Fidelis VI'' ("six times faithful and loyal")
Roman legions