|Historical marker in Westerly, Rhode Island. From Dougtone at Flickr.|
William Tanner's arrival in America is still subject to controversy and lack of source records. If he was born abroad, his arrival in America is evidenced by scanty documentary sources. References to William Tanner subsequent to hie arrival by the Reverend Tanner locate him in Westerly, Rhode Island, and specifically, in the town of Hopkinton, which was formerly part of Westerly.