Julie,

I don't know which style guide your writing environment follows, but 
the general publishing standard, as expressed by _The Chicago Manual 
of Style_, for the possessive form would be _Titus's_. (_Chicago_ 16, 
par. 7.16)

The alternate form (the apostrophe only, omitting the _s_ that 
follows) was typically applied to those cases of proper names of two 
syllables or more ending in an _eez_ sound, or of words and names 
ending in an unpronounced _s_. That's my understanding. This 
guideline is spelled out in _Chicago_ 15, pars. 7.20 and 7.21, and 
abandoned in _Chicago_ 16_, pars. 7.17 and 7.18.

The MLA handbook would seem to agree. In the 7th ed, at 3.2.7e, the 
guideline to add the apostrophe and an _s_ to any singular proper 
noun appears, with these examples --

      Venus's beauty

      Dickens's reputation


As for the plural form, I would think it would be _Tituses_.


Odile




>What is the correct spelling of the plural and possessive forms of 
>the proper name Titus?
>
>Tituses?  Titus'?  Titus's?  Some handbooks favor the apostrophe 
>here; others prefer the apostrophe and s.
>
>Many thanks for your help!
>
>Julie Suarez Hayes
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