How a Three-Year Siege Ended Five Centuries of Byzantine Power in Southern Italy
In 1068, Norman forces led by Robert Guiscard blockaded Bari, the last major Byzantine stronghold in Italy. The resulting three-year siege forced a desperate city to endure famine and failed relief attempts, ultimately collapsing in 1071 and permanently ending centuries of Roman and Byzantine control over the Italian peninsula.
By the mid-11th century, the Byzantine Empire’s influence in Italy had dwindled to a few coastal cities in Apulia. The Normans, seeking to expand their territory before turning their attention to Sicily, targeted Bari, the capital of the Catepanate of Italy. When Robert Guiscard began his siege on 5 August 1068, the city was deeply divided between those loyal to the Byzantine emperor and a pro-Norman faction. The loyalists initially prevailed, shutting the gates and appealing to Emperor Romanos IV Diogenes for military support.
The conflict devolved into a grueling war of attrition. The Byzantines successfully repelled early assaults and even destroyed a fortified bridge Guiscard built to blockade the port. However, the Normans proved relentless, capturing nearby fortresses like Brindisi by 1070. Inside Bari, conditions grew dire as famine took hold. Despite multiple attempts by the empire to send fleets and supplies—including a failed effort by the catepan Avartuteles to assassinate Guiscard—the city remained isolated. A final attempt to break the blockade in 1071 resulted in the Norman capture of the Byzantine fleet and the arrival of a new catepan, Stephen Pateran, who quickly realized the defense was untenable.
Bari’s surrender in April 1071 marked a definitive geopolitical shift. It concluded over 500 years of Byzantine presence in the region and effectively erased the last vestiges of ancient Roman administrative control in Italy. While Emperor Manuel I Komnenos attempted a reconquest in 1156–1158, the effort failed. The transition to Norman rule was complex; while Guiscard reportedly entrusted the city to a local noble named Argyritzos, early records indicate a hybrid administration featuring both Norman and native officials. This collapse not only reshaped the Italian landscape but also signaled the irreversible decline of Byzantine authority in the West.
Source: Siege of Bari
