Note: Most historians consider the seventy-second Grand Master de facto to have been the Emperor Paul I of Russia, elected (though illegally) by a group of knights in 1799 while Ferdinand von Hompesch was still regnant Grand Master. This reckoning would make Giovanni Battista Tommasi, nominated in 1803, the seventy-third Grand Master. The events surrounding the election of Tsar Paul I are described in Cyril Toumanoff's L'Ordre de Malte et l'Empire de Russie and The Order of Malta Yesterday and Today. Following the brief grand magistracy of Giovanni Battista Tommasi, the subsequent administrative heads of the Order were Lieutenant Masters ("regents") until the Papal nomination as Grand Master of one of them, Giovanni Battista Ceschi a Santa Croce, in 1878. During the final years of Grand Master von Thun und Hohenstein, 1929-31, there was a Lieutenant Grand Master but the office of Grand Master was not vacant. Another lieutenancy followed from 1951 until 1962, when Angelo de Mojana di Cologna was elected Grand Master.