Vulgar Latin
Those long nasal vowels had the same quality as ordinary long vowels. In Vulgar Latin, the vowels lost their nasalisation, and they merged with the long vowels (which were themselves shortened by that time). This is shown by many forms in the Romance languages, such as Spanish from Vulgar Latin (originally ) and Italian from Vulgar Latin (Classical Latin ). On the other hand, the short vowel and were restored in French and from and ("e" is the normal development of Latin short "i"), likely by analogy with other forms beginning in the prefix "in-".