The blind man with just one hand arrived at the main mosque in the center of the Iraqi city of Ramadi at dusk on Wednesday, flanked by Islamic State fighters.

When the evening prayer was over, the man, whose head was shrouded in black, delivered a speech to the faithful, hailing the Islamic State’s capture of the capital of Anbar Province — its greatest victory over Iraqi forces in almost a year.

Ali Attiya al-Jubouri, widely known as “the blind judge”, is one of Islamic State’s most senior figures and his presence in the mosque signaled the group’s dominance over the city, which it seized on May 17 from hapless government forces. […]