Browsing named entities in a specific section of Samuel Ball Platner, Thomas Ashby, A Topographical Dictionary of Ancient Rome. Search the whole document.
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ARX IANICULENSIS the name given by modern topographers to the fortifications that were probably erected on the Janiculum, near the later porta Aurelia, when the first stone bridge, pons Aemilius, was built across the Tiber in 179 B.C. (see IANICULUM and literature cited).