A leader of Thailand’s “red shirt” opposition group was jailed for two years for insulting the monarchy during a street protest in 2010.
The Supreme Court has upheld the ruling of a lower court that Yosvaris Chuklom was guilty of the crime of lese majeste, which can carry a penalty of up to 15 years for each offense.
The military government has made increasing use of the royal insult law against critics since taking power in 2014.
Yosvaris was a leader of the group loyal to the populist movement of ousted prime minister Thaksin Shinawatra and his sister, Yingluck Shinawatra, who was prime minister in the government that was overthrown in the last coup.