A Chinese lawyer who defended activists and others involved in politically sensitive cases has been sentenced to 12 years in prison on fraud charges, his lawyers said.
Xia Lin was sentenced by the Beijing No 2 Intermediate Court, nearly two years after being detained, lawyer Ding Xikui said.
"We've been striving to defend his innocence," Mr Ding said. "Even one day in prison is too much."
Mr Ding said Mr Xia planned to file an appeal.
Mr Xia's sentence appeared to be the heaviest for a government critic since economist and Uighur minority rights advocate Ilham Tohti was sentenced in 2014 to life imprisonment on separatism charges after he made calls for Chinese-Uighur reconciliation and greater economic justice.
Nobel Peace Prize winner Liu Xiaobo, identified by the party as an existential threat to its rule, is serving an 11-year sentence for subversion.
"The harsh sentence against Xia Lin sends the sternest warning yet to the community of human rights lawyers that they must toe the party line," said Maya Wang, a Hong Kong-based researcher with Human Rights Watch.
Ms Wang said president and party leader Xi Jinping has made clear that, despite its calls for strengthened rule of law, the party intends to use the legal system to enforce its uncontested rule. "Anyone who challenges this aspiration will not be tolerated."
Mr Ding and advocacy group Network of Chinese Human Rights Defenders said the charges against Mr Xia, who was born in 1970, related to money he borrowed from friends, who asserted they loaned it freely and had not brought legal complaints against him.
He was accused of defaulting on that debt, but no convincing evidence was provided, they said.
"He had indeed borrowed money from people, but it is just normal borrowing and lending money," Mr Ding said.
The Network of Chinese Human Rights Defenders said Mr Xia was detained on November 8 2014, as he began preparing to defend Guo Yushan, the head of a Chinese think tank, the Transition Institute.
It said Mr Guo had been detained a month earlier for supporting the Occupy Central pro-democracy movement in the semi-autonomous Chinese region of Hong Kong.
The group said that, lacking evidence of fraud, investigators instead focused on Mr Xia's association with government critics, including artist and human rights activist Ai Weiwei, whose design company, Beijing Fake Cultural Development, he helped defend from a demand for 1.85 million dollars (£1.43 million) in back taxes and fines brought in 2011.
Mr Ai ultimately lost the case, despite claims of widespread legal irregularities.
"The numerous legal violations, not least the length of time it took to bring Xia to trial, demonstrate the flimsiness of the authorities' case.
"Xia Lin should be freed on Thursday and compensated for his time in detention," human rights researcher Frances Eve said in a statement.
Chinese foreign ministry spokesman Lu Kang discounted such accusations, saying such groups likely did not represent mainstream opinion about China in the international community.
Mr Xia's case "falls within China's internal affairs... and will be handled in accordance with law," Mr Lu said.
President Xi's campaign against dissent began gathering steam in the summer of 2015, when about 300 activists and lawyers were initially seized in a round-up and questioned before most were released.
But more than a dozen of those detained last year remain in custody.