Here's what I was able to find out:
The title line above states almost all that is certainly known about Vincent, the earliest Spanish martyr whose name is known to us. It is said that he was brought to trial along with his bishop Valerius, and that since Valerius had a speech impediment, Vincent spoke for both, and that his fearless manner so angered the governor that Vincent was tortured and killed, though his aged bishop was only exiled.
He was martyred in 304 and is the patron saint of wine makers, vinegar makers and vine dressers.
So, the next time you pull out that bottle of vinegar for your salad dressing, think of St. Vincent and give thanks for his life and witness!
Also, it seems to me that if you are horrified by the prospect of book burning then Vincent is your man! His tormenters agreed to release him if he would consign his Bible to the flames. He refused, of course.