Sentence:  But tho' this Family might make an honourable Figure at the Bar, yet it ſeems a little unaccountable how a <WSD>Chancellor</WSD> of the "Bourbonnois" came to be charg'd with the Reformation of the whole "French" Kingdom. 
Meaning of the word marked with <WSD> tags:  A senior secretary or official with administrative or legal duties, sometimes in charge of some area of government such as finance or justice.