Tmogvi is a ruined castle on the left bank of the Kura River, a few kilometers downstream of the cave city of Vardzia. It is first mentioned in sources from the 9th century. It was built as a defensive work controlling the ancient trade route between the Javakheti plateau and the gorge of Kura, over a gorge formed by the Kura River. It was a crucial military stronghold in the region of Javakheti. The feudal lords of the region were at that time the Bagratids, the Georgian branch.
Tmogvi gained importance after the neighboring town and fortress of Tsunda was ruined around 900 AD. By the beginning of the 11th century, the fortress had passed under the direct control of the unified Kingdom of Georgia.
In 1073, it was given in apanage to the nobleman Niania Kuabulisdze; his descendants kept it in the following centuries, before it passed to other major feudal families such as the Toreli, the Tmogveli, the Shalikashvilior the Jaqeli. In 1088, the castle collapsed in an earthquake. The medieval Georgian writer Sargis Tmogveli was from Tmogvi. The Ottoman Empire gained control of the fortress in 1578. In 1829, the Treaty of Adrianople transferred the fortress, among with the surrounding region, to the Russian Empire.
The castle expands over 3 hills, joined and encircled by a wall (150 meters long, 3 meters wide), which supplements the natural defense offered by the cliffs. A number of towers was built on each hill. A secret tunnel connects the castle with the river to provide access to water even during a siege. The western part of the fortress is better preserved. A small number of buildings subsist inside the castle itself. A quadrangular building made of tuff on a basalt foundation is assumed to have been a church. Outside of the walls, on the western side, the church of Saint Ephrem subsists in ruined condition, with fragments of frescoes from the 13th century.References:
Sirmione castle was built near the end of the 12th century as part of a defensive network surrounding Verona. The castle was maintained and extended first as part of the Veronese protection against their rivals in Milan and later under the control of the Venetian inland empire. The massive fortress is totally surrounded by water and has an inner porch which houses a Roman and Medieval lapidary. From the drawbridge, a staircase leads to the walkways above the walls, providing a marvellous view of the harbour that once sheltered the Scaliger fleet. The doors were fitted with a variety of locking systems, including a drawbridge for horses, carriages and pedestrians, a metal grate and, more recently, double hinged doors. Venice conquered Sirmione in 1405, immediately adopting provisions to render the fortress even more secure, fortifying its outer walls and widening the harbour.
Thanks to its strategical geographical location as a border outpost, Sirmione became a crucial defence and control garrison for the ruling nobles, retaining this function until the 16th century, when its role was taken up by Peschiera del Garda.