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The reformist cleric was arrested on terrorism charges in a sweeping crackdown in September 2017, after he posted a tweet calling for "harmony between people", which Saudi authorities claim was a call for reconciliation with neighbouring Qatar.

Awdah's trial is set to take place in the anti-terror court, known as Specialised Criminal Court (SCC), where a host of reformist activists have been tried under dubious and wide-ranging new 'anti-terror' laws.

The Saudi Public Prosecutor has already said he will seek the death penalty for the 61-year-old scholar, however, his sentence will likely be officially confirmed at the trial.

"We are gravely concerned that Sheikh Salman al-Awda could be sentenced to death and executed," said Amnesty's Middle East Research Director Lynn Maalouf in a statement on Friday.

"Since his arrest almost two years ago, Sheikh al-Awda has gone through a terrible ordeal including prolonged pre-trial detention, months of solitary confinement, incommunicado detention, and other ill-treatment - all flagrant violations to his right to a fair trial."

Maalouf accused the Saudi authorities of levelling accusations of terrorism on peaceful activists in order to quash dissent.

"This trial, as well as those of other activists, who were executed last April, are clearly politically-motivated and meant to silence independent voices in the country," she said.

Maalouf said Awdah's campaigning for a more inclusive society has got him punished, in the same way women's rights activists have also been cracked down on.

"What gains are the authorities hoping to achieve by treating their own citizens this way?" Maalouf said.

"Instead of moving ahead with this sham trial, they must immediately and unconditionally release Sheikh al-Awda and drop all charges against him," her statement concluded, reiterating Amnesty's staunch opposition to the death penalty.

Read more: Fate of Saudi religious scholars on death row

Awdah was arrested without a warrant in September 2017, and detained incommunicado and in solitary confinement for the first five months of his imprisonment. He was barred access to his family and a lawyer, except for one brief phone call a month after his arrest, according to Amnesty. 

Dire prison conditions led him to be hospitalised in January 2018, however, he was only allowed to call his family a month later. 

Awdah's case attracted international attention in 2018 when Saudi Arabia's Public Prosecution levelled 37 charges against him, including "not praying enough to the ruler" and receiving text messages that "stirred discord in the region".

Awdah's son told °®Âþµº in 2018 his father has been active as a religious scholar and thinker, delivering hundreds of lectures and writing hundreds of articles on issues surrounding Sharia, Islamic law, however, at the same time, "embracing modernity and democratic rhetoric".