The disqualification ended Princess Ubolratana's stunning, short-lived candidacy for a populist party.

Thailand's Election Commission on Monday disqualified the sister of the king from running for prime minister on Monday, ending a stunning, short-lived candidacy for a populist party after King Maha Vajiralongkorn called the bid "inappropriate".

The commission released the official list of parties' candidates for prime minister without the name of Princess Ubolratana, 67, the older sister of the king.

Members of the royal family should be "above politics" and therefore cannot "hold any political office," the commission said in a statement, echoing the wording of a public statement from the king on Friday.

The princess had accepted the nomination of Thai Raksa Chart party, made up of supporters of ousted ex-premier Thaksin Shinawatra.