Assertion: castle's keep | /r/HasProperty | great tower
Facets:
value: originally
type: OTHER
Source sentences:
text: A keep was a great tower and usually the most strongly defended point of a castle before the introduction of concentric defence.
text: The keep was originally called a donjon or great tower.
text: The modern castle dates from between the 15th and early 17th centuries, when the successive ruling families of the Herberts and the Somersets created a luxurious, fortified castle, complete with a large hexagonal keep, known as the Great Tower or the Yellow Tower of Gwent.