The noun has 2 meanings:
Meaning #1:
a member (or supporter) of the house of Lancaster
Meaning #2:
a resident of Lancaster
The adjective Lancastrian has 2 meanings:
Meaning #1:
of or relating to the former English royal house or their supporters
Pertains to noun: Lancaster (meaning #2)
Meaning #2:
of or relating to the English city of Lancaster or its residents
Pertains to noun: Lancaster (meaning #1)




