|Leda and her Twins|
from one of the twin eggs after Zeus turned her mother Leda into a goose. (Horace, Ars Poetica, 147)
From this, we get the Latin proverb "Ab Ovo" (From the Egg), meaning, one need not tell any story from some unnecessary point prior to the event or in unnecessary detail.
This proverb is a nice way to lock in the ablative singular neuter form (following the preposition a/ab).
I have a collection of other Latin quotes there that you can explore.