Lusitanic definitions of "Lusitanic" or "Lusitanian" may include medieval-to-modern Galicia, because the Portuguese people and Galician people share close linguistic and cultural ties, including pre-Roman Celtic ones. Modern Portuguese and the Galician language both derive from medieval Galician-Portuguese, and the term is a cultural classification more than a historic–geographical definition. Although, in Ancient Roman times, the Gallaeci were not part of Lusitania province, what became the Galician-Portuguese language developed from Vulgar Latin in Gallaecia, which comprised what is now Galicia, as well as north Portugal, the center of the development of post-Roman Portuguese culture. Later Portuguese use of the name "Lusitania"
Roman bridge two, if on a border). The Alcántara Bridge in Lusitania, for example, was built at the expense of 12 local municipalities, whose names were added on an inscription. Later, in the Roman Empire, the local lords of the land had to pay tithes to the empire for "opus pontis". The Anglo-Saxons continued this practice with "bricg-geworc", a literal translation of "opus pontis". Built in 142 BC, the Pons Aemilius, later named "Ponte Rotto" (broken bridge), is the oldest Roman stone bridge in Rome, Italy. The largest Roman bridge was Trajan's bridge over the lower Danube, constructed by Apollodorus of Damascus,