I was reading a list of trivia facts about the US Declaration of Independence, and one of the bits was that King George III probably never read it, as he didn't read, write or even speak English very well.

I know that the House of Hanover came from Hanover, in what is now Germany, and I know that Kings George I and II were born in Hanover and never learned to speak English all that well. George III was born in the UK and presumably had British tutors, so even if he spoke German among his family, he would have learned English well enough to read and understand the DoI. Right?

So to our many British members, I ask: is the above mentioned trivia likely true, or not?