WordNet (r) 3.0 (2006):

Gustavus
    n 1: the last king of Sweden to have any real political power
         (1882-1973) [syn: Gustavus, Gustavus VI]
    2: king of Sweden who kept Sweden neutral during both World War
       I and II (1858-1950) [syn: Gustavus, Gustavus V]
    3: king of Sweden whose losses to Napoleon I led to his being
       deposed in 1809 (1778-1837) [syn: Gustavus, Gustavus IV]
    4: king of Sweden who increased the royal power and waged an
       unpopular war against Russia (1746-1792) [syn: Gustavus,
       Gustavus III]
    5: king of Sweden whose victories in battle made Sweden a
       European power; his domestic reforms made Sweden a modern
       state; in 1630 he intervened on the Protestant side of the
       Thirty Years' War and was killed in the battle of Lutzen
       (1594-1632) [syn: Gustavus, Gustavus II, Gustavus
       Adolphus]
    6: king of Sweden who established Lutheranism as the state
       religion (1496-1560) [syn: Gustavus, Gustavus I]