Gina Miller has insisted she would not let people "bring her down"
The woman behind the successful British court challenge on triggering Brexit has been subjected to a torrent of online abuse, including rape and death threats.
Gina Miller, who was born in Guyana in South America, has also been the target of racist rants by internet trolls, who have called for her to be deported.
Despite the threats, the 51-year-old investment fund manager and philanthropist has insisted she would not let people "bring her down".
It comes amid a furious backlash over the court judgment that ruled the British government could not trigger Article 50, without the backing of Parliament.
Downing Street has said it is "confident" of winning its appeal against the decision, while Theresa May told Brussels chief Jean-Claude Juncker and German Chancellor Angela Merkel the formal process for severing ties with Brussels, remained on track.
Following Thursday's court ruling Ms Miller revealed critics had previously nicknamed her "the black widow spider".
She said: "That nickname is wrong on so many levels. But I do not and will not let other people bring me down. I believe that level of abuse means I am doing something right for investors."
Many rallied to Ms Miller's defence including Labour MP Diane Abbott who said Ms Miller had been "subject to rape and death threats".
She added: "Gina Miller subjected to racist online abuse after Brexit legal challenge victory. Sadly predictable."
A US journalist also called Gina Miller was also targeted on social media and told to "F*** off to France" after trolls confused her with Ms Miller the campaigner.
The journalist wrote on Facebook: "Here's the thing: it's not me. Anyone who follows me knows I'm in no way smart enough to challenge the British government."
If the British government loses its appeal, it is believed legislation would have to be brought forward, which would have to be approved by both Houses of Parliament.
The bill could also be subject to amendments by MPs and peers seeking to shape the eventual Brexit deal or even press for a second referendum.
Mrs May has already said she wanted to trigger Article 50 by the end of March 2017 so any legislation would need to be agreed by then to avoid the UK's departure from the EU being delayed.