Oasis was originally Liam's band, performing under the name The Rain. But after watching them live, Noel offered to join – on the condition that he became chief songwriter and de facto leader.
That fait accompli brought them worldwide fame, culminating in two open-air gigs at Knebworth House in summer 1996.
Nearly five per cent of the UK population applied for tickets, with a then-record 125,000 people watching the band top a line-up that also included The Prodigy, Manic Street Preachers, Ocean Colour Scene, The Chemical Brothers, The Charlatans and a Beatles tribute.
But festering tension between the Gallagher brothers often spilled over into verbal and physical violence.
Backstage at a gig in Barcelona in 2000, for example, Noel attacked Liam after he questioned the legitimacy of his eldest daughter. The guitarist walked out for the rest of the European tour, leaving the band to continue with a stand-in.
Although they repaired the relationship, the insults and in-fighting continued until 28 August, 2009, when Oasis split up minutes before they took the stage at the Rock en Seine festival in Paris.
"People will write and say what they like, but I simply could not go on working with Liam a day longer," Noel wrote in a statement at the time.
He would later recount a backstage argument in which his younger brother grabbed his guitar and started "wielding it like an axe", adding, "he nearly took my face off with it".