Overview
The United States of the Ionian Islands was a Greek state and amical protectorate of the United Kingdom between 1815 and 1864. The successor state of the Septinsular Republic, it covered the territory of the Ionian Islands, as well as the town of Parga on the adjacent mainland in modern Greece. It was ceded by the British to Greece as a gift to the newly enthroned King George I, apart from Parga, which was sold to Ali Pasha of Ioannina in 1819.
History
Before the French Revolutionary Wars, the Ionian Islands had been part of the Republic of Venice. When the 1797 Treaty of Campo Formio dissolved the Republic of Venice, they were annexed to the French Republic. Between 1798 and 1799, the French were driven out by a joint Russo-Ottoman force. The occupying forces founded the Septinsular Republic, which enjoyed relative independence under nominal Ottoman suzerainty and Russian control from 1800 until 1807.
The Ionian Islands were then occupied by the French after the treaty of Tilsit. In 1809, Britain defeated the French fleet off Zakynthos island on 2 October, and captured Kefalonia, Kythira, and Zakynthos. The British proceeded to capture Lefkada in 1810. The island of Corfu remained occupied by the French until 1814.
Under the Treaty between Great Britain and [Austria, Prussia and] Russia, respecting the Ionian Islands (signed in Paris on 5 November 1815), as one of the treaties signed during the Peace of Paris (1815), Britain obtained a protectorate over the Ionian Islands, and under Article VIII of the treaty the Austrian Empire was granted the same trading privileges with the Islands as Britain. As agreed in Article IV of the treaty a "New Constitutional Charter for the State" was drawn up and was formalised with the ratification of the "Maitland constitution" on 26 August 1817, which created a federation of the seven islands, with Lieutenant-General Sir Thomas Maitland its first "Lord High Commissioner of the Ionian Islands".
From Wikipedia (CC BY-SA 4.0).