Brusio (Lombard:
Brus; Romansh:
Brüsch) is a municipality in the
Bernina Region 
in the canton of
Grisons 
in Switzerland.
History
Brusio is first mentioned in 1106 as Bruse. It was first mentioned as Brusio in 1212. Previously it was known as Romansh: Brüsch and German: Brüs.
The monastery of San Romerio (earlier, San Remigio) was founded above the
Val Poschiavo 
before 1055. Soon thereafter the village of Brusio was settled on the valley floor below the monastery.