December 30, 1808
The President of the United States to _______, Senator for the State of _______.
Certain matters touching the public good requiring that the Senate should be convened on Saturday, the 4th day of March next, you are desired to attend at the Senate Chamber, in the city of Washington, on that day, then and there to deliberate on such communications as shall be made to you.
TH: JEFFERSON.
Thomas Jefferson, Proclamation—Convening an Extra Session of the United States Senate Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/203667