Which empire was known for its extensive road systems and the concept of a "universal" language?

The Roman Empire is well-known for its extensive network of roads that facilitated trade, military movements, and communication across vast distances. This system of roads was integral to the Empire's ability to maintain control over its territories and promote unity among diverse cultures. The saying "All roads lead to Rome" reflects the significance of these roads in connecting various parts of the empire.

Additionally, the concept of a "universal" language during the Roman Empire is attributed to Latin, which served as a lingua franca throughout the empire, enabling communication and administration across different regions and peoples. Latin was used in government, law, literature, and education, creating a common cultural and linguistic ground that further unified the empire.

In contrast, the other empires listed had notable achievements in various areas but did not share the same extent of influence regarding road systems and a unifying language in the way the Roman Empire did. For example, while the Persian Empire had a sophisticated infrastructure, its road systems were not as extensive or as focused on connecting diverse cultures in the same way, and Persian was not used as a universal language in the same breadth as Latin in Rome.