[hockea]

Then, there is the first President of the United States to issue a Thanksgiving Proclamation, John A Hansen.
http://www.freerepublic.com/focus/bloggers/1771850/posts

Actually he was the third President after Samuel Huntington and Samuel Stockton. He was, although, the first President to fulfill the his entire term.
An interesting question regarding president(s) prior to 1789 is: When Geo Washington resigned his command of the Continental Army in 1789 to become the President, to whom did he tender his resignation?

[musicman]

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[Vigilanteman]

That would've been Cyrus Griffin, the last president of the Continental Congress. Incidentally, the next to the last was Arthur St. Clair, who is buried right here in Greensburg, Pennsylvania in a cemetery named for him.