Proper noun
Proto-Romance
The reconstructed ancestor of all the Romance languages.
Synonym: Common Romance
Hence, it is possible to speak of, for example, the loss of initial /j/ in unstressed syllables in the Vulgar Latin of Cantabria (an area in northern Spain), whereas it is meaningless to speak of a similar change in the "Proto-Romance of Cantabria". Source: Internet
During the Proto-Romance period, phonemic length distinctions were lost. Source: Internet
Note that the outcome of -am -em -om would be the same regardless of whether lengthening occurred, and that -im was already rare in Classical Latin, and appears to have barely survived in Proto-Romance. Source: Internet
The Proto-Romance loss of phonemic length originally produced a system with nine different quality distinctions in monophthongs, where only original /ă ā/ had merged. Source: Internet