From Expatica, with thanks to Anthony:
LUENEBURG – A Pakistani’s naturalisation as a German has been revoked after it emerged that he had a wife in each country, court officials said in the northern city of Lueneburg Monday….
Officials in the city of Braunschweig who later told him to give back his passport said he had failed to meet the legal requirement at the time that he fit in with the German way of life. They said having both a Pakistani wife and a German wife had disqualified him.
Judges rejected his claim that having more than one wife was a German custom. They noted that bigamy was against German law.