Leon the 87th

Leon is arguably the most recognized historic figure in the kingdoms. The modern zero-based Rena-Varra calendar begins on his birth. Through a quirk in spacetime, he served as both the first and fourth ruler of the kingdoms. At the age of 40, he fell through time to the year 100, leaving the kingdom to Grodok and returning serindipidously at the exact moment to take the reeins from the freshly deceased, and still twitching, Willard.

Rena-Varra calendar
Though it may have seemed deliberate, the Rena-Varra calendar actually started on Leon's birth by pure coincidence; 0 RV was when Rena's grandfather was born.