Four kings

Four consecutive Kings of of the Franks: Childebert III (reigned 695–711), Dagobert III (711–715), Chilperic II (715–721), Theuderic II (721–737).

Interestingly, the first king’s caption says “Childebertus IV” and labels him “saint” though that doesn’t seem to be a thing anymore; the others have no number after their names. Using different naming systems, I guess, or somebody’s paperwork got lost.