(Please correct me if I'm wrong)
Out of curiosity, I googled the history of Ayutthaya Kingdom just to figure out where exactly in the timeline is Putarn going to land in. Only while reading did I realize why there are these specific characters shown in the family tree. Putarn is going to land in Somdet Phra Chao Yu Hua Thai Sa/ Sanphet IX reign (1709-1733). But we are left off at Somdet Phra Phetracha's reign (1688-1703).
My thoughts:
Based on the scenes we've been shown so far & the fact that they bother to cast actors & actresses for the roles, I think they are going to take some time to show what happened during Somdet Phra Phetracha's reign and Somdet Phra Suriyenthrathibodi's reign (1703-1709). I don't think we'll reach the point where it transitions to Somdet Phra Chao Yu Hua Borommakot's reign (1733-1758) as there's already a whole lot of things going on to fill up the 26 episodes...then again, maybe they'll have highlight/summary scenes at the end just to explain what happens after? Who knows (shrugging emoji). But even if that happens, it might be brief because the main story is about our main 4 characters and the mystery of Krisna-kali mantra.
Looking at this picture, I wonder if they will show the dynamics and interactions between Borommakot and his 3 nephews. Google only gave me info about what happened when he took over the throne...but it never mentioned what their relationships were like before they were involved in the huge civil war.
(picture credit to ความสัมพันธ์ตัวละคร (ch3plus.com) )