Related Clues:

• Large, fortified building
• Imposing residence, perhaps fortified
• Seat of a monarch
• Seat for a royal
• Royalty sits on it
• Chair of state
• Chess piece and grand house
• Large fortified building
• Seat of royalty
• Keep a rook on board
• Keep this on board for a rook
• Sounds as if that was pitched for Majesty
• If there's a rook on board, keep it
• There's a rook on board
• Keep fifty in class