The requirements have always been formidable as originally members had to prove thirty two quarterings with thirty-four noble German ancestors, but since the 1871 reforms the requirement has been revised to proof of four hundred years of nobility in each of the four quarters and proof that all thirty-two great-great-great grandparents were noble, still rigidly enforced. The statutes were again revised on 11 December 1999 (approved by the present Head of the House, Duke Franz, on 11 January 2000), suppressing the separate clerical class (priests may join the Order as regular members, provided they have the necessary nobiliary qualifications) and simplified the regulations. They have to be at least twenty-one years of age and before admission, are examined by a committee of knights. There was originally a special "zungen" (langue or tongue) of foreign knights, who could comprise up to one third of the total membership, and did not have to prove German ancestry, but this no longer exists. The last King of Bavaria continued to maintain the Order after abdicating his throne and was succeeded by his son, Rupprecht, Crown Prince of Bavaria.