I wonder if you took inspiration from "The Timetables of History" (https://openlibrary.org/books/OL1756160M/The_timetables_of_h...)?
That book has always been a favorite of mine to just meander through and find interesting parallelism, but incorporating Wikipedia links as you've done adds a new dimension.
The hardest thing was mapping approximate date descriptions (think "1st half of 17th century") into years to draw on chart.
I've once built something similar for myself (still at https://github.com/fdw/timelines/), but not half as polished as yours. I like yours better ;)
https://github.com/SeanHollen/1300-2000
I like how your project has such a long time horizon, I'm glad you're showing it.
Another project in a similar vein that might influence you is the historical tech tree. https://www.historicaltechtree.com/ It has literally thousands of technologies all mapped together. I was curious so I calculated the most "influential" technologies: https://github.com/etiennefd/hhr-tech-tree/issues/12
I'll also have a look around your repo. And maybe I know feel inspired to put some more work into mine - thanks for the kind words.
I'm thinking of building one for climate change.