He was born in around 1246. He was a monk of Hilandar, the Serbian monastery of Mount Athos, and a priest of King Stefan Uroš III Dečanski. He focused on expanding and strengthening the cult of St. Simeon the Myrrhflowing , and Saint Sava, who had created the main focus of the Serb ethnic and cultural identity. Surrounded by the beauty of nature and the mystical atmosphere of Hilandar and Mount Athos itself, he transferred some of the beauty and serenity into his literary works, characterized by its poetic quality. He was an original and prolific writer. In the period between 1292 and 1310 he wrote a Common Canon to Christ, St. Simeon Nemanja and St. Sava, The Life of Saint Sava, Encomium to Ss. Simeon and Sava, Common Canon to Ss. Simeon and Sava, Canon to Ss. Simeon and Sava, The Life of St. Peter of Koriš, Office for St. Sava, and Office for St. Peter of Koriš. Teodosije's biography The Life of St. Sava as compared to Domentijan's, is written in less ornamented style. It is relatively free from mystical and theological elements, and it shows the author's mastery in the choice of biographical details narrated. He wrote several canons, liturgical, and other works dedicated to Saints Simeon and Sava, as well as he work on the Life of St. Peter of Korish, which is viewed as the artistically most successful art of old Serbian literature. In the work, as in the Life of St. Sava, despite the strict form of biographies, it was written with a fluent and vivid style of storytelling. The narrative is sometimes dramatic, and always from the character's point of view. Because of such tendencies, this work has been called a "novel", and Theodosius being the first Serbian novelist. Teodosije's Life of St. Sava, is viewed as a successful composition, one of the first complex parts in old Serbian literature. Teodosije was also an innovator, one who tells the many times told story, through new compositional structure of sentences and word processing, and refresh the story. In this way, the Serbian historical characters were taken from the literary monotony in which the writers of the past centuries had put them in, enlightening them from different angles. The frequent verbal sensibility shows the talent of Teodosije. He is included in The 100 most prominent Serbs. Teodosije is one of the few medieval writers whose works we can find explicit poetic views. They coincide with known Horace's thinking about the function of literature, but the ways in which these attitudes are brought into the Serbian medieval times are very specific. Their roots in ancient Greece, which is elaborated on by Hellenistic writers, and through late antique and early Byzantine, and later Athonite, enters the width of Teodosije.
