Longest Reigning European Monarchs – Emperors, Kings and Princes Queen Elizabeth II holding the 10th position of the longest reigning European Monarchs; followed by John II of Liechtenstein with a duration of 70 years and 12 days. 1. Bernard VII (1428-1511) House of Lippe Beginning of reign: August 11, 1429 End of reign: April 2, … Continue reading Longest Reigning European Monarchs (Emperors, Kings and Princes)