As was standard for new Roman cities, Hadrian placed the city's main Forum at the junction of the main cardo and decumanus, now the location for the (smaller) Muristan.
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However, as the main cardo ran up the western hill, and the Temple Mount blocked the eastward route of the main decumanus, a second pair of main roads was added; the secondary cardo ran down the Tyropoeon Valley, and the secondary decumanus ran just to the north of the temple mount.
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Aelia came from Hadrian's nomen gentile, Aelius, while Capitolina meant that the new city was dedicated to Jupiter Capitolinus, to whom a temple was built on the site of the former Jewish temple, the Temple Mount.