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In the middle of the old city Fortress of Oradea.
Oradea dates back to a small 10th century castle, while its bishopric was founded during the 11th century by King Ladislaus I of Hungary. The first documented mention of its name was in 1113 under the Latin name Varadinum. The city flourished during the 13th century. The Citadel of Oradea, the ruins of which remain today, was first mentioned in 1241 during the Mongol invasion. The 14th century one of the most prosperous period in the city's life.
Between 1464 and 1667, the fortress of Oradea used to be the site for the first Prime Meridian in the world. It also housed the first astronomical observatory in Europe. In 1667 the Prime Meridian was moved to Nurnberg, Germany and later in 1882 to Greenwich, Great Britain, where it still is today.
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Coordinates are in the WGS84 datum