After I completed the Genealogy of Middle-Earth, I contemplated what else I might explore from the lore which was of interest to me. I decided I would like to see a poster with all the major kingdoms and battles of Middle-Earth laid out on a timeline. The goal would be to see the relative duration of each realm.
I knew the general order of events from reading the Silmarillion, but I needed a lot more detail if I was to have the exact years of the founding and destruction of each dominion. The two primary resources I used were the Timeline of Arda on Wikipedia and Chronology from the Thain’s Book. With these two sources I was able to (painfully) sort through the dates of the major occurrences for the realms I was interested in. Sackings, invasions, foundings, and collapses as well as the major battles were all included. If a founding or collapse date was not available I gradually transitioned the bar into or out of existence. Some kingdoms ended in a major battle, so those dates are not always on the kingdom bar.
As I began to lay out the poster I decided to group them by what region they occupied. I organized them from west to east as you go down the page. So the realms at the top of the chart are in Aman, then Beleriand, Eriador, and Rhovanion. I also attempted to size the thickness of the bars based on the physical size of the realm, though in the end, this was difficult as I realized how many kingdoms there were.
The other issue was that of date systems. I ended up using both the ages and an absolute system. The timeline based on ages is listed on the bottom of the chart, while an absolute timeline based on the year of the sun rising as year 0 is listed at the top. Dates on the kingdom bars are according to what age they are in with the exception of first age dates from before the first sunrise, which are absolute. I also heavily compressed the Valian Age since that would be about 80% of the chart, and not much happens there in any case.
The poster ended up being quite a bit messier than the Genealogy due to how many realms are involved, but it is interesting to look at. Some things really jump out, like how long Khazad-Dum existed and how influential Cirdan is as a leader in Middle-Earth.