St. Elmo is the patron saint of which of the following?

Erasmus of Formia, also known as Saint Elmo (died c. 303), was a Christian saint and martyr. He is venerated as the patron saint of sailors and abdominal pain. Erasmus or Elmo is also one of the Fourteen Holy Helpers, saintly figures of Christian religion who are venerated especially as intercessors. Intercession is the act of praying to a deity on behalf of others, or asking a saint in heaven to pray on behalf of oneself or for others.

The 'Acts of Saint Elmo' were partly compiled from legends that confuse him with a Syrian bishop Erasmus of Antioch. Jacobus de Voragine in the 'Golden Legend' credited him as a bishop at Formia over all the Italian Campania, as a hermit on Mount Lebanon, and a martyr in the Diocletianic Persecution. There appears to be no historical basis for his passio (suffering).

Erasmus may have become the patron saint of sailors because he is said to have continued preaching even after a thunderbolt struck the ground beside him. This prompted sailors, who were in danger from sudden storms and lightning, to claim his prayers. The electrical discharges at the mastheads of ships were read as a sign of his protection and came to be called 'Saint Elmo's Fire'.