There is a maximum of 9 oral vowels, 2 semivowels and 21 consonants; though some varieties of the language have fewer phonemes. There are also five nasal vowels, which some linguists regard as allophones of the oral vowels. Galician-Portuguese developed in the region of the former Roman province of Gallaecia, from the Vulgar Latin (common Latin) that had been introduced by Roman soldiers, colonists and magistrates during the time of the Roman Empire. Although the process may have been slower than in other regions, the centuries of contact with Vulgar Latin, after a period of bilingualism, completely extinguished the native languages, leading to the evolution of a new variety of Latin with a few Gallaecian features.