War of the Sheep Islands

The Battle of the Sheep Islands was the first open-sea naval victory in Turkish maritime history, fought on May 19, 1090, between the Turkish fleet under the command of Çaka Bey and the Byzantine fleet. This naval engagement, which took place near the Sheep Islands between the island of Chios and the Karaburun Peninsula in the Aegean Sea, represents the first major military success of the Turks in naval warfare.

Representing the Battle of the Sheep Islands (Image generated by Artificial Intelligence)

Background of the Battle

By the late 11th century, the Byzantine Empire’s military and naval power along the Aegean coast had weakened. During this period, Çaka Bey established a principality centered in İzmir and began naval operations, laying the foundation for Turkish naval strength through the shipyard he built in İzmir. After capturing port cities such as Klazomenai (Urla) and Phocaea, Çaka Bey turned his attention to the islands of the Aegean Sea and conquered major ones including Lesbos, Chios, Kos, Rhodes, and Samos.

In response to these developments, Byzantine Emperor Alexios I Komnenos dispatched a fleet under the command of Niketas Kastamonites to reclaim the islands.

Course of the Battle

In early May 1090, Çaka Bey set sail from İzmir with a fleet of 17 galleys and 33 sailing ships. He captured the island of Lesbos and then moved on to Chios. Upon receiving intelligence from reconnaissance units that the Byzantine fleet was advancing southward from the Çandarlı area, Çaka Bey mobilized his forces to confront them.

On May 19, 1090, at midday, the two fleets encountered each other near the Sheep Islands. Çaka Bey ordered his ships to ram and lock onto Byzantine vessels, employing a close-quarters, boarding-based naval tactic. The bloody battle lasted until midnight, during which the majority of the Byzantine fleet was either sunk or captured. Only a few Byzantine ships managed to escape the battlefield.

Outcomes and Significance of the Battle

The Battle of the Sheep Islands holds great significance as the first open-sea naval victory in Turkish maritime history. Çaka Bey’s fleet inflicted a decisive defeat on the Byzantine navy and subsequently captured the islands of Chios and Samos. Çaka Bey’s success demonstrated that the Turks could be effective not only on land but also at sea.

Following the battle, Çaka Bey became a serious threat to the Byzantine Empire. He began strategic preparations to seize Gallipoli and Thrace with the aim of besieging Constantinople. To this end, he formed alliances with the Pechenegs in the Balkans and with Abu’l-Qasim, who had briefly seized power in the Anatolian Seljuk throne. He also attempted to recruit Turkish mercenaries serving in the Byzantine army to his side.

Çaka Bey (AA)

Developments After the Battle

After the Battle of the Sheep Islands, the Byzantines were forced to launch larger-scale military operations against Çaka Bey. However, Emperor Alexios I Komnenos’s diplomatic maneuvers proved effective: relations between Çaka Bey and Sultan I. Kılıç Arslan of the Anatolian Seljuks deteriorated. The subsequent Crusades and intensified Byzantine military pressure ultimately led to the collapse of Çaka Bey’s maritime principality.

After Çaka Bey’s death, Turkish naval activity entered a prolonged period of stagnation; Turkish operations in the Aegean Sea ceased for nearly a century. The Turks would not resume active naval engagement until the period of the Western Anatolian beyliks.