Lisbon, Portugal was known as what in ancient times?

In ancient times, Lisbon was known as Olisipo. This name has its roots in the Latin language, and historical references identify Olisipo as a settlement with origins that may date back to the Phoenician and Roman periods. The etymology of the name reflects the influences of various cultures throughout the history of the city, including the Iberians and the Romans.

Olisipo served as an important commercial and cultural center during the Roman Empire, connecting trade routes and facilitating interactions between different Mediterranean civilizations. The remnants of Roman architecture and urban planning can still be seen in modern Lisbon, illustrating the city's deep historical significance.

The other options, while they may seem plausible, do not represent the ancient name commonly recognized by historians and scholars. Lisboa is the name used in Portuguese today, while Olisipa and Lispos do not correspond with any well-documented historical references to Lisbon. Thus, Olisipo stands out as the correct ancient name for the city.