▁power ▁of ▁the ▁Cab al ▁w an ed ▁and ▁that ▁of ▁Cl iff ord ' s ▁replacement , ▁Lord ▁Dan by , ▁grew . ▁ ▁Charles ' s ▁wife ▁Queen ▁Catherine ▁was ▁unable ▁to ▁produce ▁an ▁he ir ; ▁her ▁four ▁pre gn an cies ▁had ▁ended ▁in ▁mis car ri ages ▁and ▁still b irth s ▁in ▁ 1 6 6 2 , ▁February ▁ 1 6 6 6 , ▁May ▁ 1 6 6 8 ▁and ▁June ▁ 1 6 6 9 . ▁Charles ' s ▁he ir ▁pres um pt ive ▁was ▁therefore ▁his ▁un pop ular ▁Catholic ▁brother , ▁James , ▁Duke ▁of ▁York . ▁Part ly ▁to ▁ass u age ▁public ▁fear s ▁that ▁the ▁royal ▁family ▁was ▁too ▁Catholic , ▁Charles ▁agreed ▁that ▁James ' s ▁daughter , ▁Mary , ▁should ▁marry ▁the ▁Protest ant ▁William ▁of ▁Orange . ▁In ▁ 1 6 7 8 , ▁Tit us ▁O ates , ▁who ▁had ▁been ▁altern ately ▁an ▁Ang lic an ▁and ▁Jes uit ▁priest , ▁f als ely ▁war ned ▁of ▁a ▁" Pop ish ▁Plot " ▁to ▁assass inate ▁the ▁king , ▁even ▁acc using ▁the ▁queen ▁of ▁comp licity . ▁Charles ▁did ▁not ▁believe ▁the ▁alleg ations , ▁but ▁ordered ▁his ▁chief ▁minister ▁Lord ▁Dan by ▁to ▁investigate . ▁While ▁Dan by ▁seems ▁to ▁have ▁been ▁right ly ▁s cept ical ▁about ▁O ates ' s ▁claims , ▁the ▁Caval ier ▁Parliament ▁took ▁them ▁seriously . ▁The ▁people ▁were ▁seized ▁with ▁an ▁anti - C