Sidney Rigdon (19 February 1793-14 July 1876) was an important figure in the early history of the Latter Day Saint movement. Rigdon's influence over the early years of the movement is considered by many historians to have been nearly as strong as that of church founder Joseph Smith Jr.. Wikipedia
SidneyRigdon.com is dedicated to the life and times of Rev. Sidney Rigdon (1793-1876) and includes web pages for his Writings , Chronology/History , etc. www.solomonspalding.com/
Sidney Rigdon was born February 19, 1793 in St. Clair township, Alleghany County, Pennsylvania. He was the youngest son of William Rigdon and wife Nancy Gallagher. His father died when he was seventeen years of age, and his mother passed away about nine www.gapages.com/rigdos1.htm
...Sidney Rigdon (1793 - 1876) OPENING NEW HORIZONS IN MORMON HISTORY the Rev. Sidney Rigdon Memorial Web-Site "I W ILL M AKE F OR H IM A S POKESMAN... www.sidneyrigdon.com/index2.htm
[3] Once the standard critic's explanation of the Book of Mormon, the Spalding (or Spalding-Rigdon) theory has fallen on hard times. farms.byu.edu/display.php?table=review&id=584/
The definitive Wikipedia entry for Sidney Rigdon. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Sidney_Rigdon