| I take it that monarchs below the level of King don't count? Even so, you've missed Ferdinand III of Sicily, who reigned from 1759 to 1825 (in 1816, Sicily was united with his other kingdom, Naples, to form the kingdom of the Two Sicilies, but even 1759-1816 is 57 years). You've also missed Pedro IV of Aragon (1336-1387), Sigismund of Hungary (1387-1437), and Ivan the Terrible (1533-1584). There's also the marginal case of King Frederick Augustus I of Saxony - he reigned for 64 years, but only 21 of those years as king, the other 43 as elector. |