noun, feminine/se.ne.ʃo.se/plural: sénéchaussées
a seneschalty: a district governed by a seneschal, particularly; a seneschalty: a district governed by a seneschal; the capital of a seneschalty; the seat of a seneschal; the royal court headed by a seneschal
From earlier seneschaucie, from sénéchaux (“seneschals”) + -ie (“-y; -ty”).