Early life and monastic beginnings
Romilus was born around 1330 in Vidin, then the seat of the Tsardom of Vidin, to a wealthy household of mixed Bulgarian and Greek parentage. Tradition records that even as a child he showed an unusual seriousness and detachment from ordinary childhood pursuits, a disposition noted by both his companions and his teacher.
To escape a marriage his parents had arranged, he left for Tarnovo at about fourteen or fifteen years of age and entered monastic life. He was first given the name Romanos, which was afterward changed to Romylos, the form under which he is venerated.
Hesychast formation
Romilus became a disciple of Saint Gregory of Sinai, the great propagator of the Hesychast tradition of inner, contemplative prayer in the Balkans. He followed Gregory to Paroria in the Strandzha Mountains, a celebrated hermitage colony, where he is remembered as one of the most eminent and fervent supporters of the Hesychast doctrine.
The community at Paroria lived under recurring pressure from Ottoman raids and from famine, and Romilus withdrew on several occasions to Kilifarevo near Tarnovo. In the early 1350s he moved to Mount Athos, where he settled near the Great Lavra.
Serbia and repose
After the Battle of Maritsa in 1371, which opened the southern Balkans to further Ottoman advance, Romilus moved westward, first to Valona in Albania and then into the Serbian Despotate. He came finally to Ravanica Monastery, founded by Prince Lazar of Serbia in the late 1370s and intended in part as a refuge for Hesychast monks.
He reposed at Ravanica around 1385, on January 16. His relics are kept in the narthex of the monastery church. His Life was composed before 1391 by a disciple of his named Gregory; his veneration is best attested on Mount Athos and in the region surrounding Ravanica.