How did "wrought" come to be a past tense of "work"?

Hi, Carl! :-)

wrought
c.1250, from past participle of M.E. werken (see work).
Online Etymology Dictionary

Thanks. That appears to do it. Most greatful.
Carl

this has also been discussed here below:

http://wordsmith.org/board/ubbthreads.php/ubb/showflat/Number/167311