Does anyone know the "old" words they used in the 13th century?

Question

I am doing a story set in the 13th century and i need to know what words they used

like was it

thee

thy

"eth"

and stuff? or was it different?

if there is a wikipedia site or anything that would be great

Answer 1

Word and phrase origins.

This is a map of the wheel-ruts of modern English. Etymologies are not definitions; they're explanations of what our words meant and how they sounded 600 or 2,000 years ago.

http://www.etymonline.com/

http://www.wordorigins.org/

http://www.etymonline.com/index.php

http://www.takeourword.com/index.html

http://www.word-detective.com/index.html

http://www.word-detective.com/backidx.ht...

http://www.worldwidewords.org/wordlinks....

http://www.well.com/user/smalin/unknown....

Answer 2

The time period of the English language which you are looking for is Middle English, between 1066 and the 15th century.