pretenderism
/prɪˈtɛndərɪz(ə)m/rare
noun
Support for a pretender to a throne or other seat of power; specifically (with capital initial) adherence to the cause of the Old or Young Pretender; = Jacobitism (now historical ).
Origin
Early 18th century; earliest use found in George Hickes (1642–1715), bishop of the nonjuring Church of England and antiquary. From pretender + -ism.