[quote=So Boerd]
Sphingis, not Sphinx. It appears to be customary for legion names when using nouns to use the genitive case. Germanica, not Germania.
[/quote]

We'll let it slide. For the sake of the common man, and the greater good of science. 

We can't expect everyone to be clued up. 

The real test comes with the writing, and not necessarily the quality either.