Antiquity

I was doing my reading for the day, when I learned that Latin's third declension (the evil one) has four irregular nouns. In some languages it seems that heavily used words tend to have the greatest degree of irregularity. In Spanish, for example, consider ser, estar, tener, poder, etc. These four irregular nouns are: vis (force), sus (swine), bos (ox), Iuppiter (Jupiter). How times have changed...