Liam Gallagher is taking legal action against his brother Noel for what he claims are "lies".
The former Oasis singer was enraged by comments made by his guitarist brother last month in which he alleged Liam pulled out of a major festival appearance because of a hangover.
He also disputes Noel's story that one of the factors in Oasis' split were rows over Liam plugging his clothing range Pretty Green during the band's tour.
Now the frontman – who has relaunched his music career with his new group Beady Eye – has issued a High Court writ against his brother.
He made the extraordinary move because he said he wanted Oasis fans and festival-goers "to know the truth".
Noel walked out on Oasis following a row moments before a festival in Paris two years ago.
He opened up about the decision to leave at a press conference in London last month.
The musician – who also wrote most of the group's hits – said the Gallaghers' rocky relationship worsened after Liam demanded free plugs for his clothes brand in the tour programme, which Noel opposed.
He also said Liam pulled out of an appearance at the V Festival in Chelmsford in 2009.
At the time it had been explained as a bout of laryngitis, but Noel said the reason for the no-show was his brother's "hangover".
In a statement today, Liam confirmed his legal action and said he was looking for an apology to put the record straight about the festival cancellation.
He said: "That is a lie and I want Oasis fans, and others who were at V, to know the truth.
"I was gutted when I couldn't play the gig because I didn't want to let the fans down."
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