Rocca Possente, Medieval fortress in Stellata, Italy

Rocca Possente, also called Rocca di Stellata, is a river defence on the southern bank of the Po at Stellata, a hamlet of Bondeno. It has a four-pointed star plan and was enlarged by Niccolò II d'Este in 1362; the present building was erected under Pope Urban VIII in 1629. A chain of about 600 metres linked it to the Rocca Benedetta of Ficarolo on the opposite bank.

Construction of the fortress began around 1000, with Niccolò II d'Este expanding it in 1362 to monitor river navigation. The expansion made it one of the region's most important control installations during the medieval period.

The fortress connects to the UNESCO World Heritage site of Ferrara and its Po Delta region, representing military engineering developments of medieval Italy. It served as a crucial point for monitoring and controlling river traffic.

The fortress is located on Via Argine Po, reachable via the Ferrara Nord exit on the A13 motorway. Having a car or using local transport is helpful since the location lies outside town centers.

The chain spanned roughly 600 metres to Rocca Benedetta at Ficarolo, destroyed by the river in 1670. It served both as a defensive barrier and as a customs cordon, forcing merchant ships to pay duty before passing. The four-pointed star plan, added under Niccolò II d'Este in 1362, is best read from above or on a map.