*WARNING!
This next section contains slight spoilers, proceed at your own accord.
**This is a Changes Guide, for readers to come and check when they have trouble understanding certain points in the timeline, I recommend to only read it after finishing Chapter Seven.
AoT Changes Timeline I
[The old World] in Chronological Order
≃2000 - (Ymir is 4yo) Chapters 2&7
≃2000 - (Ymir is 13yo) Chapter 7
743 - Karl Fritz and the sealing of the Walls - Chapter 3 (teaser for Arc II)
850:
- Autumn - The Medals Ceremony - Chapter 5 (follow up for the original manga, Ch.90)
- Early Winter (around December) - Chapter 5 - The Retrieving of the Fallen Soldiers' Bones in Shiganshina (follow up for RTS Arc - Original Manga)
- End of the Year - Commander Erwin's and all RTS soldiers' wake and funeral - Chapter 7
851 - Mid-Summer - Historia's nightmares and Azzy on the way - End of Chapter 5
852 - Azzy is born (in January, 29th) & Summertime Flashbacks - Chapters 4&6 (baby Az)
853 - Toddler Az - regeneration flashback - Chapter 5
854:
- Eren and Azzy's pre-Rumbling talk - Chapter 7
- "It can't be stopped" moment (Is Sunny a ghost?) - Ending of Chapter 7 *When the Timeline CHANGES
- Rumbling (Fort Salta) Chapters 3&6
- Rumbling Aftermath - Chapter 1
- Ezra is dead (stillborn) - Chapter 7 (briefly mentioned in Chapters 1&2)
859:
- January - After Historia's birthday - Chapter 7
- January - Azzy's visit and the princess' disappearance - Chapters 2,5&6
- February - Azzy awakes alone in the Field - Chapters 5&6
- Summer - Pieck visits the Island - Chapter 2
866 - A quick stop at the Royal Library - Chapters 6&7
*866 - Chapter 4 - "The Hizuru Dream" - The dream Azzy has in Chapter 4 is a teaser for Arc II and foreshadowing for how unreliable his memories are, the dream is a memory from a different Timeline.
867:
- The boy is introduced - Chapter 1 - "The Chase"
- Waking up in the field (again) - Chapters 1&2
- "A trip to Hizuru sounds nice" - Azzy runs away - Chapter 2 - briefly followed up in Ch. 3
- Armin comes back - Chapter 4
- Searching for the boy - Chapter 4
- Azzy meets Eren again - Chapter 4 (*Time runs back at the end of ch. 4)
- Paths - Sunny's introduction - Chapters 4&5
(*Sunny is Sonnenblume's nickname)
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*Deeper spoilers now, if you haven't read Chapters 1 to 7… well this won't make much sense then.
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The old World Timeline won't be completely changed in Arc II, Azzy is still present in old times in Arc I, but of course, I couldn't explore that yet as that is "his future". Arc II will be exploring the world back in that time (2000 years ago) and 100 years ago as well. All that will go parallel with a new version of "The Rumbling" and the changes made to the year 859 and the year 867. This version of The Rumbling will be "less impactful" than the previous one. In "The old World" the destruction caused by the rumbling decimated over 90% of the human population, in this second arc "The Castle" those numbers will CHANGE. (Pun 100% intended) But will that be the end? Will Azzy die in the past, like Sonnen said? How "perfect" will the "happy ending" be? Well… as they say: stay tuned!
PS.: I hope this all helps! This is supposed to work as a guide for readers, for whenever they get confused with the flash-forwards and backwards midway through chapters. And if you want more detailed explanations you can just ask me on Discord or in the Forum and I will add broader explanations to specific topics here or on Tree Notes.