- "I never knew him. Not really. I thought I had, but it wasn't until I read his journal that I realized I hadn't really known him at all. And it's too late now. Too late to tell him I misjudged him. Too late to tell him I'm sorry."
- ―Ratonhnhaké:ton after reading his father's journal.[src]
The first entry of the journal was written on 6 December 1735, two days after Haytham's tenth birthday, and goes into detail about the death of his Assassin father Edward Kenway and his subsequent tutelage under Reginald Birch, a family friend and secret Grand Master of the British Templars.
Haytham took the journal with him aboard the Providence when traveling to the colonies of British America, and continued writing entries about his exploits in the New World. The journal also described the feelings that Haytham held for his Assassin son Ratonhnhaké:ton, and his internal conflicts about the war between the Templars and Assassins.
Haytham's last entry in the journal was dated 16 September 1781, the same day that he was killed by his son during the attack on Fort George in New York. Ratonhnhaké:ton found his father's journal after his death, realizing that he had misjudged his father upon reading it, and wrote the final entries of the journal.
- Violet da Costa noted in an Abstergo Entertainment database entry on Haytham, that his journal never made a mention of Shay Cormac, despite the latter's significant role in destroying the Colonial Brotherhood of Assassins.