Text: Ireland has been inhabited since very ancient times, but Irish history really begins with the arrival of the Celts around the 6th century b.c. , Ireland's first documented invasion.
Entailment: Ireland has been inhabited since ancient times, but Irish history begins with the Celts around 6th century b.c., when it was first invaded.
Contradiction: Ireland has been uninhabited since ancient times no one has ever lived there.