Vaso Brajević was born in Mojdež, in the Bay of Kotor. He went to the maritime school in Herceg Novi, where he excelled. He was given the nickname Mavrovouniotis or Mavrovouniota, "Montenegrin", in Greece.
In 1821 he led a force of 120 Montenegrins and Greeks, and joined the early stages of the Greek revolution. His first stop was in central Greece where he met with Nikolaos Kriezotis, an old time Greek fellow warrior, leader of the Greek Revolution in Euboea, with whom he was a “Vlami”. In 1822 he participated in the fight against the Turks in Athens where he showed bravery and was widely accepted as one of the best fighters of its period. In 1824 a Greek civil war erupted and Mavrovouniotis joined forces with the government mainly composed of Greeks he knew since the early stages of the revolution. For his commitment to the side that finally won the domestic conflict he was assigned the rank of General and was given a force of 1,500 men; a considerable army at that period. In the period between 1826-27 he was one of the few guerilla fighters not to be defeated by the Egyptian forces led by Ibrahim Pasha, that nearly destroyed the Greek forces. He participated in a failed Greek expedition in Cyprus and Lebanon aiming at inciting a revolt in those areas.
In the newly established Greek state in 1830s he became a member of the elite that surrounded the first Greek King Otto, prince of Bavaria. He was both a member of the Privy Council and adjutant to King Otto. He died on 9 June 1847 and was widely admired by the Greek people as one of the leaders of the Cause and as one of the leading figures of the independent state. During his military career he had a leading role in thirty six battles and had suffered many injuries, including a penetrating wound in his chest. A dagger belonging to Mavrovouniotis is displayed at the National Museum of Athens. The bayonet-like object on the left was used as knife sharpener or muzzleloader. The dagger on the right bears the inscription : "Fighting holy battles for his friend Greece. Vassos Mavrovoniotes".
Family
Mavrovouniotis married Helena Pangalou from the well known Pangalos family, in 1826. Helena followed him throughout the harsh campaigns in the Greek mountains against the Turks. She died in 1891 and they had two sons, Alexandros and Timoleon, both of whom became generals in the Greek Army.