How did Saint Vincent become the patron saint of winegrowers?
It seems that during his lifetime, Vincent had little to do with wine or vines. There are many hypotheses put forward to explain why he became the patron saint of winegrowers. Some say he was tortured with tools that looked like a wine press, others that his name is made up from the words vin meaning wine and sang meaning blood, and other still that his saint's day of 22 January is ideal for winegrowers at a period between vinification and pruning when the vines are dormant.
But we prefer another theory that suggests that after his death, as a man of the church and a martyr, Vincent rapidly became the object of religious fervor and his body and relics traveled around Europe. To honor Saint Vincent's tunic and golden cross of Toledo - relics brought back from Zaragoza after an expedition in 542 - Childebert I, son of Clovis, had a basilica built, dedicated to Saint Vincent and the Holy Cross. The abbey was named Sainte-Croix-Saint-Vincent. Like many others, it had its own vines and the monks there called upon Saint Vincent to protect the plants and their production.
From the 7th century onwards, the name Saint Germain was associated with that of Saint Vincent, and the abbey subsequently became that of Saint-Germain-des-Prés.