Plato's "Apology" has the character of Socrates describe one such instance.

Entity and relation annotations:
id: 0
type: entity
value: text: Plato
labels: <Person>
id: 1
type: entity
value: text: "Apology"
labels: <Work_of_art>
id: 2
type: entity
value: text: Socrates
labels: <Person>
type: relation
to_id: 1
labels: Person:creates:Work_of_art
from_id: 0