Orson Pratt gave his most specific identification of the personages in the First Vision:"…in the spring of 1820…in answer to his prayers, there was the manifestation of two of the great personages in the heavens—not angels, not messengers, but two persons that hold the keys of authority over all the creations of the universe. Who were they? God the Eternal Father and his Son Jesus Christ…"
["Journal of Discourses", Vol. 21, p.308, in A Documented History of Joseph Smith's First Vision, http://beggarsbread.org/2013/04/01/a-documented-history-of-joseph-smiths-first-vision/]