Battle of Koyun Islands (alternatively called the Battle of Oinousses) was a medieval naval engagement in the

Aegean Sea The Aegean Sea ; tr, Ege Denizi (Greek language, Greek: Αιγαίο Πέλαγος: "Egéo Pélagos", Turkish language, Turkish: "Ege Denizi" or "Adalar Denizi") is an elongated embayment of the Mediterranean Sea between Europe and Asia. It ...

. The theatre of the battle was around Koyun Islands (Oinousses) which are a group of small islands between the island of

Chios Chios (; el, Χίος, Chíos , traditionally known as Scio in English) is the fifth largest Greek island, situated in the northern Aegean Sea. The island is separated from Turkey by the Chios Strait. Chios is notable for its exports of mastic ...

and

Anatolia Anatolia, tr, Anadolu Yarımadası), and the Anatolian plateau, also known as Asia Minor, is a large peninsula in Western Asia and the westernmost protrusion of the Asian continent. It constitutes the major part of modern-day Turkey. The re ...

. The belligerents were the

Beylik of İzmir Tzachas ( gr, Τζαχᾶς, Tzachás), also known as Chaka Bey ( tr, Çaka Bey)"Tzachas" is the Hellenized form of a Turkish name which does not appear in any historical documents, but was likely "Chaka", "Chagha", or "Chaqan". The name "Chaka ...

and the

Byzantine Empire The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinopl ...

. Beylik of İzmir (or beylik of Chaka) was founded by a

Turkish Turkish may refer to: *a Turkic language spoken by the Turks * of or about Turkey ** Turkish language *** Turkish alphabet ** Turkish people, a Turkic ethnic group and nation *** Turkish citizen, a citizen of Turkey *** Turkish communities and mi ...

seaman named

Chaka Bey Tzachas ( gr, Τζαχᾶς, Tzachás), also known as Chaka Bey ( tr, Çaka Bey)"Tzachas" is the Hellenized form of a Turkish name which does not appear in any historical documents, but was likely "Chaka", "Chagha", or "Chaqan". The name "Chaka ...

in the 11 the century. Although not a member of the

Seljuk Seljuk or Saljuq (سلجوق) may refer to: * Seljuk Empire (1051–1153), a medieval empire in the Middle East and central Asia * Seljuk dynasty (c. 950–1307), the ruling dynasty of the Seljuk Empire and subsequent polities * Seljuk (warlord) (di ...

house, his daughter was married to

Kılıç Arslan I Kilij Arslan ibn Suleiman ( 1ca, قِلِج اَرسلان; fa, , Qilij Arslān; tr, I. Kılıç Arslan or ''Kılıcarslan'', "Sword Lion") (‎1079–1107) was the Seljuq Sultan of Rum from 1092 until his death in 1107. He ruled the Sultan ...

of the Seljuks of Anatolia. He founded a maritime beylik (principality) around İzmir and he frequently campaigned on the Byzantine islands in east Aegean sea. After capturing the island of

Lesbos Lesbos or Lesvos ( el, Λέσβος, Lésvos ) is a Greek island located in the northeastern Aegean Sea. It has an area of with approximately of coastline, making it the third largest island in Greece. It is separated from Anatolia, Asia Minor ...

, he planned to attack the island of

. There were 17 war ships and 33 clippers under his command. However upon learning about an approaching Byzantine fleet under the command of Niketa Kastamonita, he decided to fight. The battle on the 19 May 1090 continued until night. Chaka was able to defeat the Byzantine fleet. After the battle Chaka annexed the islands of Chios and

Samos Samos (, also ; el, Σάμος ) is a Greek island in the eastern Aegean Sea, south of Chios, north of Patmos and the Dodecanese, and off the coast of western Turkey, from which it is separated by the -wide Mycale Strait. It is also a separate ...

References

{{reflist History of the Aegean Sea 1090 Anatolian beyliks Naval battles involving the Byzantine Empire Battles involving the Seljuk Empire