Almost 500 defendants appeared in a Turkish court on Tuesday in the largest mass trial yet for people accused of taking part in last year’s failed coup attempt against President Recep Tayyip Erdogan.

The 486 suspects are accused masterminding the coup effort from an airbase outside Ankara, where fighter jets took off to bomb the Turkish parliament and where senior military officers loyal to the government were held prisoner.

Among the defendants is Akin Ozturk, a former head of Turkey’s air force, whom Turkish prosecutors say was one of the leaders of the coup. Ozturk is accused of terrorism, conspiracy and treason but denies the charges.

Stripped of his rank and military titles, Ozturk was paraded into the court room in front of waiting television cameras along with 40 other of the most prominent defendants. Two Turkish police officers held his arms while a soldier with an assault rifle stood guard.