You need to decipher the following cipher:
Click here for cipher
and you will need to do so in conjunction with the following text:
Joseph Sobran's article "'Shakespeare' Revealed in Oxford's Poetry" claims to provide "conclusive proof" that Edward de Vere, Seventeenth Earl of Oxford, was actually the author of the Shakespeare canon. Sobran's "proof" consists of verbal parallels he has found between Oxford's acknowledged poetry and Shakespeare's plays and poems, and he concludes that, "[t]aken all in all, these parallels disclose the working of a single mind".END
You will also find that the following website points you to some (but not all) of the information you need:
http://en.wikipedia.org/wiki/Category:Classical_ciphers
The solution to the puzzle will get you to the cache with further info provided in geocheck below. The area can get pretty muddy in winter. Please don't leave any spoliers in the logs and replace the cache box exactly as you found it. I hope you enjoy this series as much as I have enjoyed setting it.