Koustouganes (Medieval Greek: Κουστουγάνης) was a Turkmen chieftain who was the earliest known head of the Emirate of Chalybia. He first appeared in records when he attacked the town of Kerasous in 1301.^[1]

Name

The original version of the name Koustouganes (Medieval Greek: Κουστουγάνης) is a matter of dispute. Historian Anthony Bryer connected it with the name Küçük Ağa (lit. 'little agha').^[2] Elizabeth Zachariadou suggested it was Küçdoğan.^[3] According to Necati Demir, the original form was Kuştoğan, which echoes in the toponyms of the region. The fortress of Kuşdoğan stands 36 kilometers from Giresun, nestled 4 kilometers to the north of Dereli. Tahrir defters from 1515 and 1530 refer to the village surrounding Kuşdoğan Castle as Kuştoğan. Similarly, Kuştoğan village, currently known as Kuşluhan, is situated approximately 5.5 kilometers north of Bulancak. Records from 1455 additionally list the villages of Kuşdoğan (currently a neighborhood of Gölköy District known as Kuşluvan) within the Niyabet-i Hafsamana, and the village of Kuştoğan (presently a neighborhood of Tepeköy) under the Nahiye-i Niyabet-i Gerish-i Ihtiyar. Additionally, within the Janik sanjak, Kuştoğan village (part of present-day Ünye District) was documented within the Satilmish nahiye.^[2]