Charles II of England had a male sibling.
In 1679 , Titus Oates 's revelations of a supposed `` Popish Plot '' sparked the Exclusion Crisis when it was revealed that Charles 's brother and heir -LRB- James , Duke of York -RRB- was a Catholic .	Titus Oates	Titus Oates	Popish Plot	Popish Plot	Exclusion Crisis	Exclusion Crisis
