One of the mysteries of the English language finally explained.
The highest point or culmination (of).
Mid 17th century (in an earlier sense). From post-classical Latin non plus ultra ‘(let there) not (be) more (sailing) beyond’, alleged to have been inscribed on the Pillars of Hercules (Straits of Gibraltar) from classical Latin nōn not + plūs more + ultra. So used in French and Italian.
non plus ultra/ˌnɒn plʌs ˈʌltrə/
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