Michele Rua was an Italian Catholic priest and professed member of the Salesians of Don Bosco. Rua was a student under Don Bosco and was also the latter's first collaborator in the order's founding as well as one of his closest friends. He served as the first Rector Major of the Salesians following Bosco's death in 1888. He was responsible for the expansion of the Salesians and the order had grown to a significant degree around the world at the time he died. Rua served as a noted spiritual director and leader for the Salesians known for his austerities and rigid adherence to the rule. It was for this reason that he was nicknamed "the living rule".

The Salesians of Don Bosco (SDB), formally known as the Society of Saint Francis de Sales, is a religious congregation of men in the Catholic Church, founded in 1859 by the Italian priest John Bosco to help poor and migrant youngsters during the Industrial Revolution. The congregation was named after Francis de Sales, a 17th-century bishop of Geneva.