nonjuror
noun
non·ju·ror ˌnän-ˈju̇r-ər 
-ˈju̇r-ˌȯr
: a person refusing to take an oath especially of allegiance, supremacy, or abjuration
specifically : one of the beneficed clergy in England and Scotland refusing to take an oath of allegiance to William and Mary or to their successors after the revolution of 1688
Word History
First Known Use
1691, in the meaning defined above