After the Congress of Vienna Salzig was assigned to Prussia.

Entity and relation annotations:
id: 0
type: entity
value: text: After the Congress of Vienna
labels: <Date>
id: 1
type: entity
value: text: the Congress of Vienna
labels: <Event>
id: 2
type: entity
value: text: Vienna
labels: <Location>
id: 3
type: entity
value: text: Salzig
labels: <Location>
id: 4
type: entity
value: text: Prussia
labels: <Location>
type: relation
to_id: 2
labels: Event:Occurs_at:Location
from_id: 1
type: relation
to_id: 4
labels: Location:located_in:Location
from_id: 3