Mentioned in two notes writtten in the manuscript of collected liturgical and other texts, which has been preserved in the Chludov collection of the manuscripts at the State Historical Museum in Moscow under the signature 237. Most of the Bulgarian scholars date the manuscript at about the period of 1340–1350. He probably held the position of the governor of the Porěčie district (kefalije, kepalija). He appears as a scribe of the manuscript in the prayer inscription on the folio 57v (A se Grubadinь grešni pisa kepalija u kuli Zagradskoi, i ašte kto pročte sija slovca, molju vi, bratije, rьcete bogь da prosti grešnago Grubadina, a vasь bogь). Most of the Bulgarian scholars suggested, that Grubadin wrote the manuscript in the Parorie region. On the contrary Serbian scholars assumed, that the place of the origin of the manuscript was Zagrad in the Porěčie district. The other marginal note from Grubadinь relates about the message to his lord Andrejaš, probably the son of the Serbian King Demetrios Blukasinos, about the disobedience of his garrison force (Gospodinu mi Andrejašu ōd Grubadina tvoegō kefalije...tuži mi se ōt [tvoih?] junakь neposluha).