For about 900 years, often pirate invasion were the most important feature in the history of the island. They were in full swing, especially in the Aegean in the 7th Century and beyond. Saracens, Arabs and Slavs have (all left their traces on the island, including many place names across the sea), and sentenced him to show introversion and forgetting.

The only inhabited part of the island, which could be seen from the sea at this time, was the rock (called) Ano Syra very close to the olddensely populated city. Chased The establishment of this naturally protected settlement of the people of Syros by the invaders, it is presumed, probably until the early 9th Century AD adopted. As part of the Byzantine Empire, Aegean Sea, Syros was under the rule of Diosece of Delos, Athens and then, finally, that the Kea – Thermia – Serifos.

After the fall of Byzantium to the Franks, is subject to Syros, the Venetian rule and is, together with most of the information containedCyclades Islands in the Dutchy of the Aegean Sea, 1207 in

The Venetians tried to impose administrative and financial feudal system, but to no avail. At the same time, Catholicism was founded and officially recognized by the inhabitants, while both the Greek language and Greek customs remained as alive and unchanged. Many place names, the preservation of Orthodox worship ceremonies, the Eastern church calendar, and a large number of historical sources of the timealmost exclusively written in Greek are representatives of the national identity preservation.

The Venetian rule was established by the constant struggle between Frank marked the ruler of the rule of the island. Typical of this was the siege by the Duke of Syros, Tinos, Bartholomew Gizis, 1286th year The pirate invasions followed, which increased in all affected Aegean Syros, although the island under the protection of the Western powers and the Roman Catholic Church in particular. In allSyros this time was part of the Dutchy of the Aegean, but associated with its own governor in the first instance to raise taxes. The Catholic priest was politically and economically powerful on the island.

The Turkish domination in the Aegean Sea, and grew steadily in the mid-16th Century, in the Cyclades, the Turkish – Venetian degenerate into clashes on the Turkish side. In 1537, Syros is seized by the Turks. The Turkish rule was limited to the payment of taxes, while the local government began to develop.

TheResidents (about 300), then constant attack by Frank pirates who suffered in conflict with the Turks. Very often, the locals were of such conflicts with the hottest part is the decapitation of the (Catholic endangered) Bishop of Syros Andreas Kargas Captain Ali Passas in October 1617th The Pasha as the islanders under orders the bishop as conspirators against the Turkish rule.

Meanwhile, the pirates had resulted in the depopulation of many Aegean SeaIslands. This is also in a Venetian 1563 report confirmed that the 16 islands of the Aegean Sea Dutchy only 5 inhabited island of Syros is one of them. The population reached a new low after the accident, as shown in the 1617 report by Bishop Marengo on the 27th Juni 1626th The two Turkish – Venetian war resulted that created new suffering on the island.

In 1633 Capuchin monks set Syros. Toward the end of the 17thCentury, both the administration (local decisions, taxes, etc.) and the legal decisions was favorable Syros. Local administration has been adopted: the People's Assembly, the delegates and the elders. All men over 30 in the first. The assembly gradually reaches the power to legislate. The delegates were elected by the Assembly for one year with the management of power that only the ratification of the High from the gate. The elders were old delegates, even by the electedAssembly, which contributed to the local administrative and legal decisions.

In 1680 the Community of Syros from taxes to the port of the island and thus the basis for the development of trade was exempted. The island was under the jurisdiction of the Supreme Judge Turk residing in Andros. There were no Turks on the island and the bishop was appointed by the Pope. A growing influence of French contributed to the development, as France had a number of privileges toNames of local clergy from the Turks. The name of security and financial sector development for the residents led to a growth in population and in the second half of the 18th Century, more than 2,500 people on the island (according to the testimony of a local abbot Della Roca), Orthodox Catholics, all of them except for a few families. The island will begin intensively cultivated. Young people are sent to the Italian universities in order to be educated under the auspices of the Pope.That is progress was interrupted by a cholera epidemic in 1728.

During the Russo – Turkish War (in 1771 were all the Cyclades from the Russian fleet was seized) Syros was ruled by three commanders with emergency powers. At the time of taxation (in money and goods) was dual. Meanwhile, a large number of local antiquities were looted, with the active participation of the Russian admiral.

After the islands were recaptured by Captain Pasha, repression was prevented by the positive contribution ofStephanos Mavrogenous, an interpreter of Paros Pasha (later ruler of Wallachia). Syros 1779 to 1803 was to be (directly with the niece of the Sultan, introduced the lower taxes and promote local institutions, elders, etc.) is subjected to.

In 1814 the privilege of the appointment of well-heeled people in key positions in positions of power after a popular uprising and the lower class has been canceled representatives appointed place in the local administration.

The sea routes in the eastern Mediterraneanwere safe again in 1800 and later to the decline of piracy and the consequent risk to the Aegean. Consequently, Syros, with a central geographical position, developed the constant support of Western powers and self-government quickly in a maritime center and its port has been revived. Begins at this point the Greek War of Independence.