It all started in 2014, when a bakery in Northern Ireland refused to make a cake with a slogan supporting same-sex marriage.
The bakery came to wider prominence in July 2014 when it emerged that it had declined an order in its Belfast branch from gay rights activist Gareth Lee.
He had wanted them to make a cake that included a slogan that said “support gay marriage” along with a picture of Bert and Ernie from Sesame Street, and the logo of the Queerspace organisation.
At the time, same-sex marriage was still illegal in Northern Ireland, but the law has since changed and same-sex weddings have been taking place since February 2020.
The cake was being commissioned for a civic event in Bangor, County Down, to mark International Day Against Homophobia and Transphobia.
Staff at the bakery passed the order to its head office, which considered it to be “at odds” with their beliefs.
Another bakery agreed to accept the order.
The customer who placed the order with Ashers complained to Northern Ireland’s Equality Commission, and the watchdog took up the case, warning the company it had allegedly discriminated against the man on the grounds of his sexual orientation.
The commission supported Mr Lee in taking his legal case alleging discrimination.
However, Ashers said it was taking a stand on the grounds of religious freedom.
The bakery’s stance was backed by the Christian Institute, which provided legal assistance.
The court case in Belfast ran for three days in March 2015.
During the hearings, a lawyer for the bakery argued the issue was “the cake, not the customer”.
One of the bakers, Karen McArthur, said she did not know Mr Lee was gay and it would not have mattered as they would not have been prepared to make a cake with a pro-same-sex marriage slogan for anyone.
However, Mr Lee said he felt he was discriminated against.
He said that after ordering the cake and paying for it, only to be told two days later that his order had been rejected: “It made me feel unworthy, a lesser person.”
While the debate leading up to the hearing had been often heated, the BBC’s Mark Simpson found that in the courtroom it was a different story, and there was “no heckling, shouting or jeering”.
The judge found in favour of Mr Lee, saying that as a business, Ashers was not exempt from discrimination law.
District Judge Isobel Brownlie said Ashers was “conducting a business for profit” and it was not a religious group.
The firm was found to have discriminated against Mr Lee on the grounds of sexual orientation as well as his political beliefs.
The judge said she accepted Ashers had “genuine and deeply held” religious views, but said the business was not above the law.
Damages of £500 were agreed in advance by legal teams on both sides of the dispute.
In October 2016, the owners of the bakery lost their appeal against the ruling that their refusal to make a “gay cake” was discriminatory.
Appeal court judges said that, under law, the bakers were not allowed to provide a service only to people who agreed with their religious beliefs.
Reacting to the ruling, Daniel McArthur from Ashers said he was “extremely disappointed” adding that it undermined “democratic freedom, religious freedom and free speech”.
The firm then took the case to the Supreme Court and they won.
The UK’s highest court ruled the bakery’s refusal to make a cake with a slogan supporting same-sex marriage was not discriminatory.
Then president of the Supreme Court, Lady Hale, ruled the bakers did not refuse to fulfil the order because of the customer’s sexual orientation.
“They would have refused to make such a cake for any customer, irrespective of their sexual orientation,” she said.
“Their objection was to the message on the cake, not to the personal characteristics of Mr Lee.”
And from there, Mr Lee took his case to Europe, arguing the UK Supreme Court “failed to give appropriate weight” to his case under the European Convention of Human Rights.