Thesiege of Lastovo of 1000 was anaval blockade, battle, andsiege during theCroatian-Venetian wars, fought between themedieval Kingdom of Croatia and theRepublic of Venice. Essential details of the engagement, including numbers ofcasualties and the battle's exact dates, are unknown. It resulted in Venetian victory andannexation of the island ofLastovo.

After the death ofCroatian KingStephen Držislav in 997, an ally of theByzantine Empire, his eldest son and successorSvetoslav Suronja continued his father's pro-Byzantine policy. But Stephen Držislav's younger sonsKrešimir andGojslav rebelled. With the aid ofBulgarian emperorSamuil, Krešimir and Gojslavousted their older brother in 1000 and forced him to seek refuge in Venice.

At the same time, DogePietro II Orseolo prepared his forces to take control overDalmatian city-states andNarentine territories. Several of thesemaritimecity-states had large culturally Italian populations, and many welcomed the Venetians. Other Croatian subjects—such as those on the island of Lastovo—fiercely resisted the Venetian incursion.

The exact dates of the siege of Lastovo are unknown. According toJohn the Deacon, Orseolo's medievalchronicler, the doge attended theHoly Mass onAscension Day (9 May 1000) in Venice. Then he led his fleet towardsGrado to visit thepatriarch and on 11 May he sailed southwards.

As the fleet reached Lastovo, the residents of the town did not welcome it, but waited behind thecity walls, ready to resist. Orseolo ordered them to surrender but they refused, so he started to attack the town. His troops besieged it, trying to break the town gate as well as to seize the towers of the wall. They succeeded in capturing the tower with the watercistern, which was a big setback for the remaining defenders. Finally, they were forced to surrender and to lay down their weapons. The doge spared their lives, but gave the order to his soldiers to destroy the defensive walls and to burn down the town. The citizens were moved away to the other side of the island, where they built a new settlement.

Pietro II Orseolo subjected Lastovo to Venetian authority. He next directed his fleet toDubrovnik, was there shown obeisance and then, satisfied, returned to Venice. He gave himself the titleDux Dalmatianorum (Duke of the Dalmatians), initiating themaritime empire known to the Venetians as theStato da Màr.

The island of Lastovo remained a Venetian possession until the reign of KingStephen I of Croatia (ruled 1030-1058) and his successors. In 1252 the citizenry of Lastovo joined the Community of Dubrovnik (ital.Ragusa), later known as theRepublic of Ragusa.

• Timeline of Croatian history
• Timeline of the Republic of Venice
• Croatian-Venetian wars
• Siege of Zadar (998)
• Military history of Croatia
• Military history of the Republic of Venice

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• Doge Pietro II Orseolo concentrated his forces against the islands of Korčula and Lastovo
• Doge Orseolo took over many Dalmatian towns and islands
• Venetians captured Vis in 998 and Lastovo in 1000
• Defenders of Lastovo laid down their arms and Doge resolved to spare them all, insisting only that their town should be destroyed
• King Stjepan I of Croatia continued policy of integrating Dalmatia into the Kingdom of Croatia

• 1000 in Europe
• 10th century in the Republic of Venice
• Conflicts in 1000
• Battles involving medieval Croatia
• Sieges involving the Republic of Venice
• Venetian period in the history of Croatia
• Sieges involving Croatia
• Lastovo
• 10th-century military history of Croatia

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