Ishak Pasha's memoir pages

A memoir page.

Ishak Pasha's memoir pages contained the writings of vizier and Assassin Ishak Pasha. In the early 16th century, they were scattered atop various landmarks across Constantinople.

The Mentor of the Italian Assassins, Ezio Auditore da Firenze, was able to collect all ten pages of the memoir around 1511 to 1512, discovering them to contain the location of Ishak Pasha's tomb within the Hagia Sophia. Upon navigating the Hagia Sophia's interior, Ezio retrieved Ishak Pasha's personal armor.

Trivia

• By collecting all of the pages, the "Worth a Thousand Words" achievement could be earned.
• Despite being Ishak Pasha's memoirs, the pages could not be read in-game.
• A map revealing the pages' locations could be bought in any book shop in Constantinople after collecting 25 Animus data fragments.

Source

• Assassin's Creed: Revelations