Latin origin, Sardinian nonetheless retains a number of traces of the linguistic substratum prior to the Roman conquest of the island: several words and especially toponyms stem from Paleo-Sardinian and, to a lesser extent, Phoenician-Punic. These etyma might refer to an early Mediterranean substratum, which reveal close relations with Basque. In addition to the aforementioned substratum, linguists such as Max Leopold Wagner and Benvenuto Aronne Terracini trace much of the distinctive Latin character of Sardinia to the languoids once spoken by the Christian and Jewish Berbers in North Africa, known as African Romance. Indeed, Sardinian was perceived as rather similar to African Latin when the latter was still in use, giving credit to the theory that vulgar Latin in both Africa and Sardinia displayed a significant wealth of parallelisms. J. N. Adams is of the opinion that similarities in many words, such as acina (grape), pala (shoulderblade) and spanu(s) ("reddish-brown"), prove that there might have been a fair amount of vocabulary shared between Sardinia and Africa. According to Wagner, it is notable that Sardinian is the only Romance language whose name for the Milky Way (, "the Way of Straw") also recurs in the Berber languages. To most Italians Sardinian is unintelligible, reminding them of Spanish, because of the way in which the language is acoustically articulated; characterized as it is by a sharply outlined physiognomy which is displayed from the earliest sources available, it is in fact considered a distinct language, if not an altogether different branch, among the Romance idioms; George Bossong summarises thus: "be this as it may, from a strictly linguistic point of view there can be no doubt that Sardinian is to be classified as an independent Romance language, or even as an independent branch inside the family, and so it is classed alongside the great national languages like French and Italian in all modern manuals of Romance linguistics". History Sardinia's relative isolation from mainland Europe encouraged the development of a Romance language that preserves traces of its indigenous, pre-Roman language(s). The language is posited to have substratal influences from Paleo-Sardinian, which some scholars have linked to Basque and Etruscan; comparisons have also been drawn with the Berber languages from North Africa to shed more light on the language(s) spoken in Sardinia prior to its Romanization. Subsequent adstratal influences include Catalan, Spanish, and Italian. The situation of the Sardinian language with regard to the politically