His father was the Serbian King Vukašin (co-ruler with Stefan Uroš V).
His brother was the Serbian King Marko, who ruled the region of Macedonia (Old Serbia) from 1371 to 1395.
He held a territory of his older brother Marko's realm, he minted his own coins and had the title of "King" (hence "Kraljević").
[1] After the death of Marko in 1395, Andrijaš and his brother Dmitar left Macedonia to settle with the Serbs in Ragusa, there they receive a treasure which their father King Vukašin had left for them.
[2] According to the Dečani chronicle, Andrijaš died in the Battle of Rovine.