Of all the Imperial Fora complexes, Trajan's was the grandest and most imposing, a veritable city unto itself. Designed by architect Apollodorus of Damascus, it comprised a vast basilica, two libraries, and a colonnade laid out around the square, all once covered with rich marble ornamentation. Adjoining the forum were the Mercati Traianei (Trajan's markets), a huge, multilevel brick complex of shops, walkways, and terraces that was one of the marvels of the ancient world.
To build a complex of this magnitude, Apollodorus and his patron clearly had to have great confidence, not to mention almost unlimited means, centuries of experience, and cheap labor at their disposal. Very little is known about the markets' original function: they may have been the Roman equivalent of a multipurpose commercial center, with shops, taverns, and depots, as well as offices for regulating Rome's enormous food supplies. They also contained two semicircular lecture halls, one at either end, which were likely associated with the libraries in Trajan's Forum. The markets' architectural centerpiece is the enormous curved wall, or hexedra, that shores up the side of the Quirinal Hill exposed by Apollodorus's gangs of laborers. Covered galleries and streets were constructed at various levels, following the hexedra's curves and giving the complex a strikingly modern appearance.
As you enter the markets, a large, vaulted hall stands in front of you. Two stories of shops or offices rise up on either side. It's thought that they were either a bazaar or an administrative center for food handouts to the city's poor. Head for the flight of steps at the far end that leads down to Via Biberatica. (Bibere is Latin for "to drink," and the shops that open onto the street are believed to have been taverns.) Then head back to the three tiers of shops that line the upper levels of the great hexedra and look out over the remains of the forum. Though empty and bare today, the cubicles were once ancient Rome's busiest market stalls. Wine, oils, flowers, perfumes, shoes, clothing, and household goods were all sold in this thriving market -- everything a burgeoning and sophisticated population desired. There's evidence that the market was equipped with fresh- and saltwater tanks so the Romans could buy their fish live. Though it seems to be part of the market, the Torre delle Milizie (Tower of the Militia), the tall brick tower, which is a prominent feature of Rome's skyline, was built in the early 1200s. In those times wealthy families vied with one another to build the strongest, highest defensive towers. Pope Boniface VIII bought this one from the Conti family so that he could use it as a stronghold to defend his Roman territory against his archenemies, the Colonnas.
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