Vincent was born at Huesca but lived in Saragossa, where he was martyred under the Emperor Diocletian around the year 304.
He served as the deacon of Valerius of Saragossa, the city's bishop. Imprisoned in Valencia for his faith, and tortured on a gridiron — a story perhaps adapted from the martyrdom of another son of Huesca, Saint Lawrence— Vincent, like many early martyrs in the early hagiographic literature, succeeded in converting his jailer. Though he was finally offered release if he would consign Scripture to the fire, Vincent refused.
The earliest account of Vincent's martyrdom is in a carmen (lyric poem) written by the poet Prudentius, who wrote a series of lyric poems, Peristephanon ("Crowns of Martyrdom"), on Hispanic and Roman martyrs. Prudentius describes how Vincent was brought to trial along with his bishop Valerius, and that since Valerius had a speech impediment, Vincent spoke for both, but that his outspoken fearless manner so angered the governor that Vincent was tortured and martyred, though his aged bishop was only exiled.
According to legend, after being martyred, ravens protected St. Vincent's body from being devoured by vultures, until his followers could recover the body. His body was taken to what is now known as Cape St. Vincent; a shrine was erected over his grave, which continued to be guarded by flocks of ravens.
by whose grace and power your holy martyr Vincent
triumphed over suffering and was faithful unto death:
strengthen us with your grace,
that we may endure reproach and persecution
and faithfully bear witness to the name
of Jesus Christ your Son our Lord.