Simplify the following text for a Grade 5 native English-speaking person.
Original: Richard II ( 6 January 1367 â `` 14 February 1400 ) was the son of Edward the Black Prince , Prince of Wales , and Joan of Kent `` The Fair Maid of Kent '' .
Simplified: Richard II ( 6 January 1367 â `` c. 14 February 1400 ) was the eighth King of England of the House of Plantagenet and the last of that house 's main-line kings .