In 2009 the BBC defended a claim that in AD 524 the Yemeni Jewish Himyar tribe, led by King Yusuf Dhu Nuwas, had offered Christian residents of a village in what is now Saudi Arabia the choice between conversion to Judaism or death, and that 20,000 Christians had then been massacred. The BBC stated that "The production team spoke to many historians over 18 months, among them Nigel Groom, who was our consultant, and Professor Abdul Rahman Al-Ansary professor of archaeology at the King Saud University in Riyadh." Inscriptions documented by Yousef himself show the great pride he expressed after massacring more than 22,000 Christians in Zafar and Najran.