Mrnjava (Serbian: Мрњава) was a Serbian provincial nobleman, born in Zahumlje, a frontier province in the western Serbian Kingdom. Mrnjava is the eponymous founder of the notable Mrnjavčević family; his son Vukašin Mrnjavčević became the co-ruler of the Serbian Empire (1365–1371) as King during the fall of the Serbian Empire.Mrnjava's father was Mrnjan (Latin: Mergnanus; fl. c. 1280-1289), a financial chancellor (Latin: camerarius, sr. kaznac, lit.