Sergius (or Serge) and Bacchus were fourth-century Roman Christian soldiers revered as martyrs and saints by the Catholic, Eastern Orthodox and Oriental Orthodox Churches. Their feast day is 7 October.
The saints' story is told in the Greek text known as The Passion of Sergius and Bacchus. The story is ostensibly set during the reign of Roman Emperor Galerius
(305 to 311), though it contains a number of contradictions and
anachronisms that make dating difficult. The work itself may date to the
mid-5th century. (Woods, David (2000). "The Origin of the Cult of SS. Sergius and Bacchus". From The Military Martyrs. Retrieved June 25, 2009.)
They are the most famous example of two Christian who engages in a Adelphopoiesis, or adelphopoiia type union.