In celebration of the twelfth anniversary of the Church, 16 companies of the Nauvoo Legion march in review before a huge crowd. Sidney Rigdon then gives a speech before those who have gathered to watch the parade. The southeast cornerstone of the temple, representing the First Presidency, is laid with great ceremony. (The basement of the temple was dug and walled before this time in readiness for the cornerstone.) The high priests then lay a second cornerstone; the high council lays the third cornerstone; and the bishops lay the fourth cornerstone.
[Conkling, Christopher J., Joseph Smith Chronology]