**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 Fourteen.
AoT Changes Timeline II
[The Castle] in Chronological Order
≃2000 - (Ymir is 4yo) Chapter 9
- Toddler Ymir arrives in the past through the tree portal and wonders through the dark forest
≃2000 - (Ymir is 13yo) Chapter 12 (also mentioned in ch. 9)
- Ymir becomes The Founder
≃2000 - (Ymir is 16yo) Chapter 9
- AY talk near the river (away from battle)
≃2000 - (Ymir is 18-19yo) Chapters 8, 10&11
- the Queen's "spy" leaves the marlean army and joins the eldian army
- finding out more about Ludvík, the King's "right hand man"
≃2000 - (Ymir is 25yo) Chapter 12
- picnic with the girls - Maria, Rose & Sina (sweet)
- the battle of the merciless
*Az is two years older than Ymir, when he jumps to the year when she is 13 (when she first transforms), he is 15. When she is 16, he is 18. When she's 19, he is 21, and so on.
When she dies, she is 26 and when he dies, he is 28. (but more on that on the final arc)
≃2000 - (the night after Ymir's death) Chapters 13&14
- the "ceremony" (Goodbye Maria, Rose & Sina)
≃2000 - (thirteen years after Ymir's death) Chapter 14
- The Nine Titans and Paradise Island
741 - Armin Tybur arrives in Paradise Island - Chapters 9&10
743 - The Sealing of the Walls - Chapter 10
820 - Grandfather Ackermann dies - Ending of Chapter 10
841 - Levi joins the Survey Corps, Kenny visits his brother & Armin's parents die - Chapter 11
844 - Mikasa and Armin first meet - Chapter 11
850 - Kenny's Funeral & Mikasa's dagger - Chapter 11
852:
- Azzy's birth at the Lighthouse/ A certain reemergence at Tybur Lake - Chapter 12
- Raiding Tybur Castle's vault - Chapter 13
853 & 854 - Quick and sweet Lighthouse flashbacks (the nephew and the scarf) Chapter 13
854:
(Pre-Rumbling)
- Looking for Eren (around Marley) Chapter 10
- Questioning the Queen about Eren's whereabouts - Chapter 12
- BACK at the beginning - Gabi shoots Eren - Ending of chapter 14 *when time runs back and the timeline CHANGES
(Rumbling - before time ran back)
-The Harbour - the plan is formed - Chapter 12
-The Queen's Farm - Historia gives birth - Chapters 12, 13 &14
-Near Tybur Castle - The fight against the Founder - Chapters 12, 13 &14
858 - Quick Sunny & Azzy flashback at Tybur Castle - Chapter 13
859:
- Mountain trip - Chapter 8
- Back to Paradise - Chapters 8&9
(Armin and Mikasa visit the Queen and her family)
-Toddler Ymir disappears to never return - Chapter 9
867:
- Uncle Levi comes to visit - Chapters 8&9
- The state visit - Chapter 8
- Armin's plane crash and vigil - Chapters 9&10
- Azzy jumps back in time - Chapters 9&10
- Ezra's Birthday - Chapter 12
870:
- Ezra and Azzy talk in the garden - Chapter 10
- Azzy asks Sunny for help to go much further back in time - Chapter 11
871 - Sonnenblume leaves Hizuru and Mikasa behind to follow her own path. - Chapter 14
There are many similarities and little references to the way the first arc unraveled in this second arc. I suppose it's easier to spot certain trends when the timelines are put side by side. The third arc is coming soon to complete this story!