Thailand's most powerful and polarising statesman Thaksin Shinawatra arrived at the Supreme Court Tuesday for a ruling which could see him jailed in a watershed moment for his imperilled political dynasty.

Shinawatra's political clan has for two decades been the key foe of Thailand's pro-military, pro-royalty elite who view their populist brand as a threat to traditional social order.

But the dynasty's momentum is flagging after a litany of legal and political setbacks, last week culminating in their party being ousted from the prime minister's office.

Thaksin, 76, faces a day of personal reckoning on Tuesday, when the Supreme Court is scheduled to issue a ruling on whether he properly served a 2023 prison term.

Analysts say the ruling -- due from around 10:00 am (0300 GMT) -- may see

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