Episcopate and the Serbian Church
Jacob governed the Serbian Church during the early period of its leadership (1219–1346), when archbishops administered the ecclesiastical structure that Saint Sava had established as an autocephalous archbishopric in 1219, before the patriarchate was instituted in 1346.
He stood within the succession of early Serbian archbishops after Saint Sava: Arsenije I, Sava II, Danilo I, Joanikije I, Jevstatije I, Jacob, Jevstatije II, and Sava III. In some accounts he is also referred to as Jacob the New of Tuman.
His ministry was marked by special care for Serbian ascetics and by his support of monastic life. He provided liturgical books and church accessories to the monastery of Studenica.