Nilus the Younger was a 10th and 11th-century monk and abbot from Calabria who established Italo-Byzantine monasticism in southern Italy. Born into a Greek-rite family in Rossano, he initially lived a secular life before turning to asceticism following an illness. He practiced the Rule of Saint Basil, serving as a hermit and later as a monastic leader. He is recognized for his theological knowledge and his efforts to maintain peaceful relations between different Christian traditions during his lifetime.