Six inmates have been convicted of their part in a prison mutiny which sparked a 15-hour riot at HMP Birmingham, causing millions of pounds of damage.
Luke Mansell, 24 and John Burton, 39, were found guilty of their roles in the trouble which spread to four wings, and saw 500 prisoners let out of their cells.
Four others - Ross Wilkinson, Robert Smith, Nathan Weston and Grant Samed - all admitted a charge of prison mutiny before trial.
Order was only restored at the G4S-run jail after hundreds of specially-trained "Tornado" team prison officers, backed by riot police, were drafted in to quell the riot on December 16 last year.
The two men, who had denied prison mutiny at Birmingham Crown Court, were convicted on Friday after a trial lasting nearly three weeks.
Jurors failed to reach verdicts on a charge of mutiny for two others, Carl Brookes, 33, and 30-year-old Ross Queen, and the six men and six women were formally discharged by the judge.
Brookes and Queen had previously admitted a separate charge of taking an unauthorised photo in jail.
All those convicted will be sentenced next week.