Sirmione is a comune in the province of Brescia, in Lombardy. It has a historical centre which is located on the Sirmio peninsula that divides the lower part of Lake Garda.
Starting from the 1st century BC, the area of the Garda, including what is now Sirmione, became a favourite resort for rich families coming from Verona, then the main Roman city in north-eastern Italy. The poet Catullus praised the beauties of the city and spoke of a villa he had in the area.
In the late Roman era (4th–5th centuries AD) the city became a fortified strongpoint defending the southern shore of the lake. A settlement existed also after the Lombard conquest of northern Italy: in the late years of the Lombard kingdom, the city was capital of a judiciary district directly subordinated to the king. Ansa, wife of King Desiderius, founded a monastery and a church in the city.