Could all the kings of Saxony be grouped under:
House of Wettin (Albertinian line)
Also seems to apply to the (Albertinian line) Electorat of Saxony, but hasn't double checked that.
Sources
https://en.wikipedia.org/wiki/List_of_rulers_of_Saxony#Kingdom_of_Saxony
Done
» Forum policy
Used time zone is UTC+2:00.Current time is 03:02.