Who was the "Mysterious Man"?

"The myth goes that on July 4, 1776, while sequestered behind locked doors, the Continental Congress of the 13 British Colonies (our Founding Fathers) were in hot debate on whether or not to sign the Declaration of Independence and break from Great Britain. Most of the men feared for their lives and their family’s lives, for if they were to sign such a document, they would be traitors to the crown, and would almost certainly be put to death if found. As these men were debating the issue, and leaning toward NOT signing, a mysterious man arises from out of nowhere. “Citing the grievances that had brought them to this moment he said, ‘Sign that parchment. They may turn every tree into a gallows, every home into a grave and yet the words of that parchment can never die. For the mechanic in his workshop, they will be words of hope, to the slave in the mines—freedom.’ And he added, ‘If my hands were freezing in death, I would sign that parchment with my last ounce of strength. Sign, sign if the next moment the noose is around your neck, sign even if the hall is ringing with the sound of headman’s axe, for that parchment will be the textbook of freedom, the bible of the rights of man forever.’ And then it is said he fell back exhausted."
http://holyfetch.com/mystery-man-convinces-signing-declaration-independence/

"The Mysterious Man was an unknown individual who is said to have been at the signing of the Declaration of Independence. Supposedly as the founding fathers were about to give up on the idea of signing the Declaration due to fear of death when a mysterious man stood up and gave a speech which inspired the founding fathers to sign the Declaration."
https://conspiracy.fandom.com/wiki/The_Mysterious_Man

"The problem is that nobody knew who this skilled orator and advocate for the rights of man was, he completely disappeared after delivering his hell and brimstone exhortation to sign, and subsequent descriptions of him suggest that he was pretty creepy. And in fact, nobody is sure it happened at all. Let’s set the stage."
https://esoterx.com/2016/09/24/the-best-speech-never-given-phantom-of-the-continental-congress/

Who put a handprint on the Declaration of Independence?