What did King George III do during the enlightenment?

Answer 1

Everything he did!

"There is little consensus on when to date the start of the age of Enlightenment and some scholars simply use the beginning of the 18th century or the middle of the 18th century as a default date.[7] ...As to its end, some scholars use the French Revolution of 1789 or the beginning of the Napoleonic Wars (1804-15) as a convenient point in time with which to date the end of the Enlightenment.[8]"

Note that "18th century" means 1700s, the time of his reign.

KGIII died in 1820, but his son had been acting as regent for some years by then. So, everything he did, he did during the enlightenment...

Answer 2

King George II didn't live during the Age of Enlightenment. He was born circa 30 years prior to the ordeal and died when the first Enlightenment philosophers were just starting to develop theses. The primary player in the Enlightenment was George's son King George III