A Turkish Anatolian beylik on the Aegean coast famous for its seaborne raiding fleet, which under Umur Bey in the 1330s-40s made it a major maritime power contesting Venetian and Crusader shipping in the Aegean.
Weakened after Umur Bey's death and repeated Latin naval crusades; annexed by the Ottoman Empire in stages through 1426.
The standard dedicated English-language scholarly study of the Aydinid beylik's maritime power and its Venetian/Crusader conflicts, covering exactly this window.