'William Knowlton, of Ipswich, Mass., ... Married first, Jan. 10, 1640/1, Elizabeth, daughter of John and Elizabeth Balch, of Salem, Mass., born -----, 1620; died -----, 1653, Ipswich, Mass.'
There seems to be little consensus that Elizabeth's maiden name was Balch. I could not confirm the marriage date, although it is also suggested by Torrey.