Nobel Peace Prize laureate Ales Byalyatski went on trial in Belarus on Thursday, facing up to 12 years in jail in a case his allies see as political retribution for his rights work.

The 60-year-old, who co-founded the Viasna human rights group, and two other representatives of the group who also went on trial watched from inside a metal cage before proceedings were adjourned until Friday. All pleaded not guilty. Byalyatski is one of the most prominent of hundreds of Belarusians who were jailed during a violent crackdown on anti-government protests that erupted in the summer of 2020.

He shared the Nobel Peace Prize with Russian rights group Memorial and Ukraine’s Center for Civil Liberties last October, but had been arrested in 2021 along with the two co-workers from Viasna.

The trio face from seven to 12 years in jail on charges of financing protests and smuggling money. Byalyatski has not commented on the allegations publicly and his lawyer is prohibited from disclosing information about the case.Television footage from the courtroom showed the three men seated on benches inside the metal cage, handcuffed and in silence as proceedings began. A fourth rights defender who fled Belarus is being prosecuted in absentia in the same case.

Viasna said on Twitter that the judge had refused to conduct the trial in Belarusian instead of Russian, and rejected Byalyatski’s request for a translator.

It also did not consider a request to remove the handcuffs and rejected an appeal by Byalyatski’s attorney to free him from custody, the group said.Some 30 people had appeared at the courtroom, including Western diplomats, but most were not allowed inside.

Viasna took a leading role in providing legal and financial assistance to hundreds of Belarusians who were jailed during mass protests that flared when long-time leader Alexander Lukashenko, in power since 1994, claimed a landslide election victory in 2020.

“The allegations against our colleagues are linked to their human rights activity, the Viasna human rights centre’s provision of help to the victims of politically motivated persecution,” the group said of the case.

Byalyatski and his colleagues have been labelled “political prisoners” by fellow rights defenders. Those rights advocates estimate there are around 1,500 political prisoners in Belarusian prisons.

Around 50,000 people have been detained for taking part in protests or criticising the authorities since 2020, they say.