BANGKOK (Reuters) - A Thai magazine editor was jailed for 10 years on Wednesday for insulting the royal family under the country's draconian lèse-majesté law, a sentence that drew condemnation from international rights groups and the European Union.

Somyot Prueksakasemsuk (C), editor of "Voice of the Oppressed", a magazine devoted to self-exiled former Prime Minister Thaksin Shinawatra, gestures as he arrives at the criminal court in Bangkok January 23, 2013. REUTERS/Chaiwat Subprasom

Somyot Prueksakasemsuk, editor of "Voice of the Oppressed", a magazine devoted to self-exiled former Prime Minister Thaksin Shinawatra, was found guilty of publishing articles in 2010 defaming King Bhumibol Adulyadej.

The articles criticised the role of a fictional character meant to represent the king, public prosecutors said in a July 2011 report. Discussions about the role of the monarchy are forbidden.

"The accused is a journalist who had a duty to check the facts in these articles before publishing them. He knew the content defamed the monarchy but allowed their publication anyway," a judge said in passing sentence.

The European Union Delegation to Thailand said the verdict and sentence undermined the right to freedom of expression.

"At the same time, it affects Thailand's image as a free and democratic society," it said in a statement.

New York-based Human Rights Watch said the ruling was "more about Somyot's strong support for amending the lèse-majesté law than about any harm incurred by the monarchy".

Rights groups say the lèse-majesté law is used by Thailand's powerful elite to silence political opponents, including supporters of pro-Thaksin groups.

"The lèse-majesté law works against the long-term interests of the Thai monarchy," said David Streckfuss, a Thailand-based independent scholar and lèse-majesté expert. "To a society that is becoming ever more politically conscious, the holding and trying of defendants seems arbitrary, petty and a clear violation of human rights."

Somyot, who was jailed for an additional year on an unrelated defamation conviction, was arrested on the lèse-majesté charge while Oxford-educated, pro-establishment Abhisit Vejjajiva was prime minister.

Current Prime Minister Yingluck Shinawatra, Thaksin's sister, promised to amend the law during her 2011 election campaign but has rowed back on that since coming to office, causing divisions among her supporters.

Websites accused of defaming the royal family are frequently shut down.

"Thailand's 2007 Computer Crimes Act effectively muzzles those who want to express an honest opinion and 75 percent of websites shut down since it came into force have been because of so-called anti-monarchy content," said Sawatree Suksri, a criminal law lecturer at Thammasart University in Bangkok.

Convictions under the law carry a maximum jail term of 15 years.

The 85-year-old king, who has been in hospital since 2009, is seen by many in Thailand as a unifying, semi-divine father figure.

National unease over what follows his reign has contributed to tensions in the country since before Thaksin was toppled by the military in 2006, leaving the country divided broadly between royalists and nationalists on the one side and Thaksin's mostly lower-class supporters on the other.

(Additional reporting by Aukkarapon Niyomyat; Editing by Alan Raybould and Nick Macfie)

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