Assertion: ship | /r/HasProperty | constructed about 500 bc
Facets:
value: probably
type: DEGREE
value: by the greeks
type: OTHER
Source sentences:
text: The addition of an outrigger permitted the employment of a third bank of oars, the rowers of which sat above and outside the other two; such a ship, which was called a trireme, was probably first constructed about 500 bc by the Greeks.