Kaamelott

Kaamelott's four first seasons (called "livres", French for "books") were composed of short episodes (about 3 and a half minutes each.) Early seasons consisted of humorous depictions of daily life at King Arthur's court and of the knights' ineffective quest for the Holy Grail; but as the author grew more self-confident, it got spiced by more and more continuity (including Retcon at some point), half-serious story arcs. The fifth season then had longer episodes (7 minutes) and a Darker and Edgier tone. The sixth season depicts Arthur's youth in Rome (partly filmed in the décors of the series of the same name, in Cinecittà.)