Young Tarcisius was carrying the Eucharist (Sacrament) to a group of Christians
when he encountered a group of enemies who tried to snatch the Eucharist from him.
Tarcisius preferred to lose his life rather than grant their request to give up the Eucharist
which he considered to be the "Body of Christ".  Tarcisius is buried inside of the San Callixtus Catacombs.