Only two months after leaving the presidential palace in disgrace, Park appeared at the Seoul Central District Court with a badge bearing her prisoner number pinned to her blue trouser suit, and no make-up.
She avoided meeting the glance of her longtime secret confidante and co-accused Choi Soon-Sil.
The trial, expected to last for months, is the final act in the drama that engulfed Park, the daughter of a dictator who went on to be elected president herself before being sacked by the country's top court.
She responded: "I don't have any occupation."
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Park, 65, is the third former South Korean leader to stand trial for corruption.
She was impeached by parliament in December after mass demonstrations -- fuelled by economic and social frustrations -- demanding her removal over a scandal centred on Choi, her friend of 40 years, and implicating some of the country's top businessmen.
Park was detained soon after her dismissal -- Tuesday's court session was her first public appearance since then -- and indicted on 18 charges including bribery, coercion and abuse of power for offering governmental favours to tycoons.
They include Samsung heir Lee Jae-Yong, who is being tried separately, and Shin Dong-Bin, the chairman of retail giant Lotte, the South's fifth-biggest conglomerate, who was among the accused on Tuesday.
On her most serious count, Park is accused of taking or seeking bribes totalling 59.2 billion won (USD 52 million) for Choi or herself, most of which went to non-profit foundations which Choi controlled.
Park met Samsung's Lee in July 2015 and told him she hoped the succession at the world's biggest smartphone maker "would be resolved smoothly under her government", asking him to support the foundations, according to prosecutor Hwang Woong-Jae.
Park is also accused of letting Choi, who has no title or security clearance, handle a wide range of state affairs including senior appointments. She has previously blamed Choi for abusing their friendship.
In a calm and measured voice the former head of state denied all the charges against her.
Half-sobbing, Choi herself told the court: "I feel very sorry for causing President Park to stand trial like this. President Park is not a person who could be lured by any bribes."
After the hearing adjourned for the day Park was put back into handcuffs and returned to the detention centre where she is being held.
Former presidents Chun Doo-Hwan and Roh Tae-Woo served jail terms in the 1990s for charges including bribery and treason, and ex-president Roh Moo-Hyun -- the mentor of new leader Moon Jae-In -- killed himself in 2009 after being questioned over graft.
If convicted of bribery, Park faces a minimum sentence of 10 years in jail, and a maximum of life.
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