What national holiday did George Washington proclaim?

On October 3, 1789, in his first year as 1st U.S. President, George Washington [February 22, 1732-November 14, 1799] issued a proclamation, to make November 26th "A Day of Publick Thanksgiving and Prayer." Thirty-second U.S. President Franklin Delano Roosevelt [January 30, 1882-April 12, 1945] changed the holiday, in 1939, to the third Thursday in November; and then in 1941, to the fourth Thursday in November.