Rainerius was a 12th-century Catholic priest from Pisa who is honored as the patron saint of both the city and travelers. Born into a wealthy merchant family, he spent his youth as a traveling musician before undergoing a spiritual transformation. After experiencing a vision in the Holy Land, he renounced his commercial wealth to live in extreme poverty. He eventually returned to Pisa to live a monastic life, where his reputation for holiness and preaching grew significantly.