E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Parallel.
None but himself can be his parallel. Wholly without a peer; Quris Alcd parem; nemo proxinius nec secundus. There are many similar sentences; for example:
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Nemo est nisi ipse.Seneca: Hercules Furens, 1. 81. (Seneca lived B.C. 5832.)