From the Widener manuscript, Free Library of Philadelphia, Widener 002, 3rd quarter of the 15th century.

Your forgery assignment is from the first leaf (Genesis!)--first 9 (truncate) lines, up to (but not including) "Et ainsi".

Reading assignment: the second leaf, right-hand column, "Salemon le filz David" and following, as well as (if you have time) the third leaf, right-hand column, "Un homme estoit en la cité" and following.  Good luck!  I think you'll do great--I'm guessing you'll find this one easy.