Google's Ngramm Viewer suggests that jury of publicly available books is hung between Titus' and Titus's...

http://books.google.com/ngrams/graph?content=Titus+%27%2CTitus%27s&year_start=1550&year_end=2012&corpus=0&smoothing=10

Best,

D

From: Assembly for the Teaching of English Grammar [mailto:[log in to unmask]] On Behalf Of GERALD W WALTON
Sent: Wednesday, September 19, 2012 6:15 PM
To: [log in to unmask]
Subject: Re: Plural/possessive question

What is the correct spelling of the plural and possessive forms of the proper name Titus?

Plural is Tituses
Possessive, depending on preferred usage, is Titus' or Titus's

Gww
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