Based on the passage, he is referring to King George III.
The summary of the passage
The speaker is referring to King George III based on the information given in the passage. The passage describes King George III by citing some of his doings; such as
Obsructing the administration of Justice.
Making judges dependent on his Will alone.
King George III constructed many offices and send officers to harass the people.
He also standing armies amongst the people without the legislature's consent during the time of peace.
He made the military independent and superior to civil powers.
