Final answer:
Benedict, an Italian bishop, told the monks to leave Constantinople and live in their own monasteries. He wrote a book known as the Rule that laid out how monks should live, which became influential in the development of monasticism.
Step-by-step explanation:
The person who told the monks to leave Constantinople and live in their own monasteries was Benedict, an Italian bishop. He wrote a book known as the Rule in about 529 that laid out how monks should live. The Rule dictated a strict schedule for daily life that revolved around prayer, study, and useful work for the monastery itself. Benedict's work was influential in the development of monasticism and many monasteries followed his guidelines.