Filed from 4 published puzzles

LIEGES

Set to 3 different clues across 4 published puzzles, most often “Vassals” — The New York Times, Saturday, 27 September 2008.

6 letters

Every clue on record, most used first

Vassals2 times
The New York Times — Saturday, 27 September 2008
Subjects studied by medieval scholars?once
The New York Times — Thursday, 2 July 2009
Feudal lordsonce
The New York Times — Sunday, 13 October 1996

Other answers to these clues

MESNES6 letters
SERFS5 letters