In the Catholic tradition, the patron saint of horses is St. Martin of Tours. Also the patron saint of soldiers, St. Martin left behind a promising position in the army to serve God.
After being forced into the army at the age of 15, St. Martin became renowned for conducting himself more like a monk than a warrior. He left as a conscientious objector at the age of 23 and established a monastery near Poitiers, which is thought to be the first monastery in France. Subsequently, he began amassing a group of disciples and preaching in the countryside. By the time of his beatification, St. Martin was famed for fighting paganism while also begging mercy for heretics.