Princess Ubolratana Mahidol, 67, will stand for a party allied to divisive ex-prime minister Thaksin Shinawatra, according to registration papers.

Her decision breaks with the tradition of the Thai royal family publicly staying out of politics.

Thailand's election is scheduled to take place on 24 March.

The election is being closely watched as the first chance for Thailand to return to democracy after five years under military rule.

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