The Bulgarian Tsar Ivan III Šišman (reigned 1371-1395) issued a charter, the so-called "Rilska gramota", for the Monastery of St. John (Ivan) of Rila on 21 September 1378. Therein, he confirmed existing possessions and donated new ones as well as privileges to the monastery. It seems that Vlach population was living in the surrounding area of the monastery, since the Bulgarian Tsar is stating that none of the "primikjuri" ("primićuri") shall exercise power over the population belonging to the monastery. The "primikjur" or "primićur" was the head of a "katun" (a temporary Vlach settlement), which points to the existence of pastoral economy (and possibly Vlach population) in the area.