Lousonna was a Gallo-Roman port during Roman times. The port town was important for commerce with links on Lake Geneva to Roman towns such as the present-day Geneva, Nyon, and Villeneuve.
However, during Roman times, Lausanne was never of political or military importance. Although borders shifted, Lausanne was mostly a backwater at the southern most parts of Germania, ruled from Mainz. Political and military power in the region was concentrated in Avenches and Yverdon-les-Bains.
From the fourth century onwards, Lausanne gradually moved uphill to higher grounds with the Roman port town eventually abandoned. Today, the Roman ruins are some way from the lakeshore, as the level of Lake Geneva was permanently lowered during the nineteenth century. The immediate area is used for various sport facilities and a great area for outdoor activities and strolls along the shores of the lake.
The Musée Romain in Lausanne-Vidy is a fairly small museum on Roman history. The ground floor of the museum, which is built over the foundations of a Roman villa, is used for temporary exhibitions. These exhibitions can cover much more than just the Roman era. As this area is half the museum, the theme and quality of the display very much influence whether the museum is worth visiting at all. Fortunately, the displays are generally excellent and manage to link historic themes well with the present day.
A short walk from the Roman Museum – pass underneath the highway towards the lake – is the Lausanne Roman Archaeological Park. Here many Roman foundations have been uncovered. Visitors can freely explore the archaeological park. Information tables explain the Roman town layout and buildings. The temple was a good 71 m long but the antique port wall is probably the more impressive.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.