Gustavian
adjective
Gus·ta·vi·an
(ˌ)gəˈstāvēən,
gu̇ˈs-,
-täv-
: of or relating to the reign of the Swedish kings or any one of the Swedish kings named Gustavus (as III and IV)
Word History
Etymology
Gustavus (any of several kings of Sweden) + English -ian