According to this map from Hyrule Historia, the Era of Decline starts with the tragedy of princess Zelda 1. Zeldafan1982 (talk)
Hyrule Historia reference[]
Encyclopedia doesn't mention that the Era of Decline starts from and includes the tragedy of Princess Zelda 1. Therefore, I think that the HH reference should be added. Zeldafan1982 (talk) 15:12, 2 April 2020 (UTC)