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In page Romance languages:

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ae became /ɛː/ by[citation needed] the 1st century a.d. at the latest. Although this sound was still distinct from all existing vowels, the neutralization of Latin vowel length eventually caused its merger with /ɛ/ < short e: e.g. caelum "sky" > French ciel, Spanish/Italian cielo, Portuguese céu /sɛw/, with the same vowel as in mele "honey" > French/Spanish miel, Italian miele, Portuguese mel /mɛl/. Some words show an early merger of ae with /eː/, as in praeda "booty" > *prēda /preːda/ > French proie (vs. expected **priée), Italian preda (not **prieda) "prey"; or faenum "hay" > *fēnum [feːnũ] > Spanish heno, French foin (but Italian fieno /fjɛno/).