Hohensax is a ruined castle in the Sennwald. The castle was built around 1200 by the barons of Sax, and was destroyed in 1446. In 1248, the castle passed to Ulrich von Sax, founder of the Sax-Hohensax line of the noble family. The castle was plundered in a feud of 1393, and sold together with the villages of Sax and Gams to the dukes of Austria. In the Old Zürich War, the people of Appenzell captured and slighted the castle in 1446.
After this, the barons of Hohensax resided in the nearby Forstegg castle at Salez. In 1640, the ruin passed to the barony of Sax-Forstegg, one of the constituent parts of the canton of Linth of the Helvetic Republic in 1798, and later the canton of St. Gallen. It included the villages of Sax, Salez and Gams.References:
The Amphitheatre of the Three Gauls was part of the federal sanctuary of the three Gauls dedicated to the cult of Rome and Augustus celebrated by the 60 Gallic tribes when they gathered at Lugdunum (Lyon). The amphitheatre was built at the foot of the La Croix-Rousse hill at what was then the confluence of the Rhône and Saône.
Excavations have revealed a basement of three elliptical walls linked by cross-walls and a channel surrounding the oval central arena. The arena was slightly sloped, with the building"s south part supported by a now-vanished vault. The arena"s dimensions are 67,6m by 42m. This phase of the amphitheatre housed games which accompanied the imperial cult, with its low capacity (1,800 seats) being enough for delegations from the 60 Gallic tribes.
The amphitheatre was expanded at the start of the 2nd century. Two galleries were added around the old amphitheatre, raising its width from 25 metres to 105 metres and its capacity to about 20,000 seats. In so doing it made it a building open to the whole population of Lugdunum and its environs.