To begin with, worth mentioning is the fact that the island has been inhabited since prehistoric times. In addition, according to mythology, the first inhabitants of Halki were the Titans. Pelasgians, Carians, Dorians and Phoenicians lived successively on the island. Without a doubt, Halki seems to have been a place of worship of the god Apollo since there are remains of 3 temples in the location of Pefkia. In historical times the island was subordinate to Kamiros, while later it was part of the Delian Alliance where it was administratively dependent on the Athenians. Then it again becomes part of the administration of Kamiros. In the following centuries it followed the rise and fall of Rhodes. Subsequently, it is important to realize that the control of the island changed many hands. In particular, the island fell into the hands of the Arabs in the 7th century until 825 when it was liberated. Later, in 1204 the Venetians and the Genoese arrived on the island. Then, in the 14th century the Knights of Rhodes granted it as a fief to the Assanti family from Ischia. Last but not least, in 1523 Halki was conquered by the Ottomans. Equally important is that Halki takes part in the revolution of 1821. A point often overlooked is that the island reaches a very high level of prosperity in the middle of the 19th century where trade and sponge farming develop. At the same time, schools are established. Unfortunately, the island was occupied by the Italians in 1912, a time when trade and sponge farming were abolished, which began to suffer from the last years of turkish rule. Nevertheless, finally, during World War II, Halki was glorified thanks to the struggles and sacrifices of important personalities such as Lieutenant Alexandros Diakos and Captain Diogenis Fanourakis. Eventually the island was united with the rest of Greece in 1948.