From the watchtower you can see the order the windows light up below. The last one to light always stays lit longest.

• Head Butler HydenYour Excellency has never had cause to climb the watchtower before.
  Chancellor OrfevreThe wind is fine tonight. Don't you care for it, Steward?
• Sir RoidenThe watchtower belongs to knights.
  Chancellor OrfevreThen be sure to count your knights carefully tonight, Sir.