Palermo ( p-LAIR-moh, -LUR-, Italian: [palrmo] (listen); Sicilian: Palermu [palmm], locally also Paliemmu or Palimmu) is a city in southern Italy, the capital of both the autonomous region of Sicily and the Metropolitan City of Palermo, the city's surrounding metropolitan province. The city is noted for its history, culture, architecture and gastronomy, playing an important role throughout much of its existence; it is over 2,700 years old. Palermo is in the northwest of the island of Sicily, by the Gulf of Palermo in the Tyrrhenian Sea.

The city was founded in 734 BC by the Phoenicians as Sis ("flower"). Palermo then became a possession of Carthage. Two Greek colonies were established, known collectively as Panormos; the Carthaginians used this name on their coins after the 5th century BC. As Panormus, the town became part of the Roman Republic and Empire for over a thousand years. From 831 to 1072 the city was under Arab rule during the Emirate of Sicily when the city became the capital of Sicily for the first time. The Arabs shifted the Greek name into Balarm, the root for Palermo's present-day name. Following the Norman conquest, Palermo became the capital of a new kingdom, the Kingdom of Sicily, that lasted from 1130 to 1816.The population of Palermo urban area is estimated by Eurostat to be 855,285, while its metropolitan area is the fifth most populated in Italy with around 1.2 million people. In the central area, the city has a population of around 676,000 people. The inhabitants are known as Palermitani or, poetically, panormiti. The languages spoken by its inhabitants are the Italian language and the Palermitano dialect of the Sicilian language.

Palermo is Sicily's cultural, economic and tourism capital. It is a city rich in history, culture, art, music and food. Numerous tourists are attracted to the city for its appealing Mediterranean climate, its renowned gastronomy and restaurants, its Romanesque, Gothic, Baroque and Art Nouveau churches, palaces and buildings, and its nightlife and music. Palermo is the main Sicilian industrial and commercial center: the main industrial sectors include tourism, services, commerce and agriculture. Palermo currently has an international airport, and a significant underground economy.

In fact, for cultural, artistic and economic reasons, Palermo was one of the largest cities in the Mediterranean and in Europe and is now among the top tourist destinations in both Italy and Europe. It is the main seat of the UNESCO World Heritage Site Arab-Norman Palermo and the Cathedral Churches of Cefal and Monreale. The city is also going through careful redevelopment, preparing to become one of the major cities of the Euro-Mediterranean area.Roman Catholicism is highly important in Palermitan culture. The Patron Saint of Palermo is Santa Rosalia whose Feast Day is celebrated on 15 July. The area attracts significant numbers of tourists each year and is widely known for its colourful fruit, vegetable and fish markets at the heart of Palermo, known as Vucciria, Ballar and Capo.

The Allies, later known formally as the United Nations, were an international military coalition formed during the Second World War (1939–1945) to oppose the Axis powers, led by Nazi Germany, Imperial Japan, and Fascist Italy. Its principal members by 1941 were the United Kingdom, United States, Soviet Union, and China.

Membership in the Allies varied during the course of the war. When the conflict broke out on 1 September 1939, the Allied coalition consisted of the United Kingdom, France, and Poland, as well as their respective dependencies, such as British India. They were soon joined by the independent dominions of the British Commonwealth: Canada, Australia, New Zealand and South Africa. Consequently, the initial alliance largely resembled that of the First World War.

As Axis forces began invading northern Europe and the Balkans, the Allies added the Netherlands, Belgium, Norway, Greece, and Yugoslavia. The Soviet Union, which initially had a nonaggression pact with Germany and participated in its invasion of Poland, joined the Allies in June 1941 after Operation Barbarossa. The United States, while providing some materiel support to European Allies since September 1940, remained formally neutral until the Japanese bombing of Pearl Harbor in December 1941, after which it declared war and officially joined the Allies. China had already been at war with Japan since 1937, but formally joined the Allies in December 1941.

The Allies were led by the so-called "Big Three"—the United Kingdom, the Soviet Union, and the United States—which were the principal contributors of manpower, resources, and strategy, each playing a key role in achieving victory. A series of conferences between Allied leaders, diplomats, and military officials gradually shaped the makeup of the alliance, the direction of the war, and ultimately the postwar international order. Relations between the United Kingdom and the United States were especially close, with their bilateral Atlantic Charter forming the groundwork of the alliance.

The Allies became a formalized group upon the Declaration by United Nations on 1 January 1942, which was signed by 26 nations around the world; these ranged from small nations far removed from the war, to governments in exile from the Axis occupation. The Declaration officially recognized the Big Three and China as the "Four Powers", acknowledging their central role in prosecuting the war; they were also referred to as the "trusteeship of the powerful", and later as the "Four Policemen" of the United Nations. Many more countries joined through to the final days of the war, including colonies and former Axis nations.

After the war ended, the Allies, and the Declaration that bound them, would become the basis of the modern United Nations; one enduring legacy of the alliance is the permanent membership of the U.N. Security Council, which is made up exclusively of the principal Allied powers that won the war.