stylistic:style_transfer
Roman era

Following the defeat of Hannibal in 202 BC during the Punic wars, the Romans determined to deprive Carthage of its most valuable possession: Hispania (the Iberian Peninsula). The defeat of Carthaginian forces by Scipio Africanus in Eastern Hispania allowed the pacification of the west, led by Consul Decimus Junius Brutus Callaicus. Decimus obtained the alliance of Olissipo (which sent men to fight alongside the Roman Legions against the northwestern Celtic tribes) by integrating it into the empire, as the Municipium Cives Romanorum Felicitas Julia. Local authorities were granted self-rule over a territory that extended 50 km (31 mi); exempt from taxes, its citizens were given the privileges of Roman citizenship, and it was then integrated with the Roman province of Lusitania (whose capital was Emerita Augusta).

Lusitanian raids and rebellions during Roman occupation required the construction of a wall around the settlement. During Augustus ' reign, the Romans also built a great theatre; the Cassian Baths (underneath Rua da Prata); temples to Jupiter, Diana, Cybele, Tethys and Idea Phrygiae (an uncommon cult from Asia Minor), in addition to temples to the Emperor; a large necropolis under Praça da Figueira; a large forum and other buildings such as insulae (multi-storied apartment buildings) in the area between Castle Hill and the historic city core. Many of these ruins were first unearthed during the mid-18th century (when the recent discovery of Pompeii made Roman archaeology fashionable among Europe's upper classes).

The city prospered as piracy was eliminated and technological advances were introduced, consequently Felicitas Julia became a center of trade with the Roman provinces of Britannia (particularly Cornwall) and the Rhine. Economically strong, Olissipo was known for its garum (a fish sauce highly prized by the elites of the empire and exported in amphorae to Rome), wine, salt, and horse-breeding, while Roman culture permeated the hinterland. The city was connected by a broad road to Western Hispania's two other large cities, Bracara Augusta in the province of Tarraconensis (Portuguese Braga), and Emerita Augusta, the capital of Lusitania. The city was ruled by an oligarchical council dominated by two families, the Julii and the Cassiae, although regional authority was administered by the Roman Governor of Emerita or directly by Emperor Tiberius. Among the majority of Latin speakers lived a large minority of Greek traders and slaves.

Olissipo, like most great cities in the Western Empire, was a center for the dissemination of Christianity. Its first attested Bishop was Potamius (c. 356), and there were several martyrs during the period of persecution of the Christians: Verissimus, Maxima, and Julia are the most significant examples. By the time of the Fall of Rome, Olissipo had become a notable Christian center.