Simplify the following text for a Grade 6 native English-speaking person.
Original: The Prince Octavius ( 23 February 1779 -- 3 May 1783 ) was a member of the British Royal Family , the thirteenth child and eighth son of George III .
Simplified: Prince Octavius ( 23 February 1779 - 3 May 1783 ) was the eighth son of George III and Queen Charlotte .