He was a son of King
Gustavus Adolphus (
Gustav II Adolf) and his mistress
Margareta Slots. In 1626 he was enrolled at
Uppsala University. In 1633, during the
Thirty Years' War, Gustav entered the Swedish military service and the next year was appointed
Lutheran Administrator of the
Prince-Bishopric of Osnabrück. In 1637 he was ennobled with the title of
Vasaborg, echoing his father's membership of the
House of Vasa. In 1647 he was made Count of Nystad in the
Swedish nobility and in 1648 received
Wildeshausen in
Lower Saxony as his own fief, after it had been won by Sweden at the
Peace of Westphalia of that year. He was married to Countess Anna Sofia Wied-Runkel, who long outlived him, dying in 1694. {{cite web|url= https://www.historiesajten.se/visainfo.asp?id=401|title= Gustav af Wasaborg|publisher=Historiesajten In 1649 Gustav unsuccessfully sought the position of
Lord High Admiral in succession to
Carl Carlsson Gyllenhielm, an illegitimate son of his grandfather
King Charles IX. Dissatisfied with the outcome, he returned to Lower Saxony and died there at Wildeshausen. His body was brought back to Sweden for burial at
Riddarholmskyrkan in
Stockholm. ==Children==