Succession to Saint Sava
Arsenius was a close disciple of Saint Sava, founder of the autocephalous Serbian Church. Within the Žiča monastery he served as Sava's synkellos and rose through the offices of ecclesiarch and archimandrite on account of his devotion.
When Hungarian invasions threatened Serbia, Sava dispatched Arsenius southward to establish a safer episcopal see. Arsenius chose Peć, where he built a monastery and a church initially dedicated to the Holy Apostles. Consecrated bishop in 1233, he succeeded Sava as Serbian archbishop and served until 1263.