All Emperors are in the order they first ascended. I plan to create a part 2 and 3 to cover the rest of Roman (Byzantine) history.
We do not have an exact birth date or even birth year for some Emperors - for those that are especially unclear I removed the age at ascension on their bar.
Some fun facts:
\- The longest period without an Emperor being murdered was \~94 years between Domitian and Commodus's deaths.
\- Every member of the Severan dynasty (except Severus himself) was murdered before they could finish their 20s. #education source