Ilarion (fl. 1219) was the Serbian Orthodox bishop of Zeta and Hum in the first half of the 13th century. He was a disciple of Archbishop Sava, and was a hieromonk of Hilandar during Sava's trip to the Patriarch Manuel I of Constantinople in Nicaea (1219). After the of the Serbian Church (15 August 1219), hegumen Metodije of Hilandar was appointed the bishop of Raška and Ilarion was appointed the bishop of Zeta; Raška and Zeta were the central regions of the Medieval Serbian state. Ilarion was thus the first bishop of Zeta. He was also the bishop of Hum, seated at the Monastery of the Holy Mother of God in Ston (now Croatia). In literature, he is also known as Ilarije or Ilarion Šišović (Иларион Шишовић), based on local tradition, which claims that he was born in the Šišović village in the tribal region of Građani. In the historical-anthropological work Riječka nahija u Crnoj Gori (1911) by Andrija Jovićević, local folklore has been collected, including notes on Ilarion and his family. Jovićević states that Ilarion's grandfather was a Serb from Prizren.