First settlements on the Limerick`s territory mentioned by Ptolemy in its map of Ireland as "Regia", foundation date of the city - 812 AD. Industry of modern Limerick performed by world famous companies: Johnson & Johnson, Procter & Gamble, Olympus. Nearby Limerick City Shannon Free Zone located, such companies as Lufthansa Technik, Intel, Veritas Software and Avocent operate here. Limerick has well developed infrastructure which include airport, waterway transport system and railway hub. Limerick is one of the main higher education centers of Ireland, two well known higher-education institutions located in City: Limerick Institute of Technology and University of Limerick. Numerous tourists visit Limerick and its places of interest: St John's Cathedral, King John's Castle, St Mary's Cathedral.