This video discussing the v in Latin is interesting, and mentions b/v in Spanish. But watching this gives some insight on how these sounds merged over time, and

This video discussing the v in Latin is interesting, and mentions b/v in Spanish. But watching this gives some insight on how these sounds merged over time, and has interesting clips of dialects of other Romance languages where this effect occurs to a greater or lesser extent. The comments are well worth reading too. https://www.youtube.com/watch?v=hovf-UK-toQ https://www.youtube.com/watch?v=hovf-UK-toQ