Mamata Banerjee, affectionately called Didi, will take her oath as the chief minister of the eastern Indian state of West Bengal for the third time on Wednesday. This was announced by her party on Monday.

"Mamata has already been re-elected as the party leader. She will be administered the oath of office by the Governor of West Bengal in state capital Kolkata on May 5," Partha Chatterjee, the secretary-general of the Trinamool Congress, told the media.

Bucking anti-incumbency, Mamata scripted history on Sunday by single handedly pulling off an astounding victory in the assembly election. She not only staved off a massive challenge from India's ruling BJP but also decimated the Left Front.

Also read: Bucking anti-incumbency, Mamata scores a hat-trick in Bengal

Though her party swept back to power with a resounding majority of 213 seats in the 292-member assembly, the 66-year-old lost her own seat in Nandigram to her former protege-turned-rival Suvendu Adhikari by a thin margin of around 2,000 votes.

"This is Bangla's win... this is Bengal's win... this is your win. This win has saved Bengal, it has saved the culture and tradition of Bengal," she said, addressing a press meet on Sunday evening.

Mamata, however, made it clear in that presser only that she would challenge the result in a court of law. "How come the Election Commission reverse the results in Nandigram after formally announcing it? We will move court."

In Nandigram, the Election Commission initially announced that Mamata had won by 1,200 votes but subsequently declared Adhikari as the winner. The polling officer also rejected a plea for a recount of votes.

The BJP though has made major gains in Bengal, winning some 77 seats. In 2016, the party had just three legislators in the state. However, the Left Front has failed to grab a single seat this time. The Left Front ruled Bengal for 34 years -- from 1977 to 2011.

Also read: Bangladeshis Living In Bengal, Casting Votes Are Indians: Mamata Banerjee

In fact, West Bengal witnessed the most high-profile contest in India's recently held state elections. While Mamata harped on being Bengal’s daughter, the BJP asked people to vote for "change and socio-economic development" after 50 years of Communist and Trinamool Congress rule.