Captain William Morgan

He is said to have been a Mason for 30 years, when in 1826 he departed the Fraternity and decided to publish a book about the secrets of the Masons.

It is reported that he was dumped into the Niagara River by 3 Masons, one of whom was named Henry L. Valance.

The book was published in 1827, after Morgan was either dead or at least no longer around his previous location.

The book was called "Illustrations of Masonry by one of the Fraternity Who Has Devoted Thirty Years to the Subject"

(See "Rule by Secrecy" page 218)

It has also been said that he departed the USA and moved to Canada, where he had worked in the past.

It is also not, to the best of my knowledge,  confirmed that he ever was a Mason but he may have been accepted as such.

Morgan moved to Batavia, New York in 1825.  It is is Genessee County. He was known as an operative mason, an indulger in strong drink, and of a bad disposition. If he was ever made a Freemason it has never been disclosed where he was mad a Mason.  It is known that he received the capitular degrees in LeRoy, New York, on the avouchment of a Mason in good standing. A newspaper man named Miller assisted him in the printing of his book about Freemasonry.(See "The Story of Freemasonry" by Sibley Chapter 4)