Dublin is the largest city in Ireland and the capital city of the Republic of Ireland. The English name is derived from the Irish name Dubh Linn, meaning "black pool". It is a primate city with a population of 506,211, and an urban population of over 1 million, containing almost 25% of the country's population. Dublin is situated near the midpoint of Ireland's east coast, at the mouth of the River Liffey, and at the centre of the Dublin Region. Originally founded as a Viking settlement, it evolved into the Kingdom of Dublin and became the island's primary city following the Norman invasion. The city expanded rapidly from the 17th century, and for a brief period was the second largest city within the British Empire and the fifth largest in Europe. After the Act of Union in 1801, Dublin entered a period of stagnation, but remained the economic centre for most of the island. Following the partition of Ireland in 1922, the new parliament, the Oireachtas, was located in Leinster House. Dublin became the capital of the Irish Free State and later of the Republic of Ireland.

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