Assertion: chess set's piece | /r/HasProperty | a 13th century bishop
Facets:
Source sentences:
text: Another piece is a 13th century bishop carved from walrus ivory, found at Stegeborg Castle, Ostergotland.
text: The final piece is a 13th century walrus rook found in Stockholm.
text: Another piece is a 13th century walrus queen found at Vastergotland, Sweden.