In Assassin's Creed II, what is the name of the codex author whose pages Ezio collects?

In Assassin's Creed II, the codex pages Ezio collects were written by Altaïr Ibn-La'Ahad.

The codex is a collection of Assassin records created by Altaïr, the protagonist of the first Assassin's Creed. Ezio finds pages across Renaissance Italy and returns them to the villa at Monteriggioni, where they become part of the wider investigation into the Templars and the ancient artifacts at the center of the story.

The pages contain observations, diagrams, historical information, and technical material. Their importance is both practical and symbolic: they connect Ezio's Renaissance campaign to Altaïr's earlier life and show how Assassin knowledge is transmitted across generations.

The codex should not be confused with the game's characters who help Ezio interpret it. Leonardo da Vinci deciphers and translates parts of the pages, while Niccolò Machiavelli becomes an important Assassin ally. Altaïr's name is also spelled with a diacritic in many official and reference materials.