The win was a first British Group One success for Murphy.
O'Brien felt 2000 Guineas victor Saxon Warrior had not suffered too much due to the interference and was thrilled with his performance just a week after finishing third in the Irish Derby. Hawkbill set the early pace, but was edged late for third by Cliffs of Moher.
Stewards did examine the result, with the inquiry over Roaring Lion's inward move on Saxon Warrior near the finish.
He said: "The head on looks like they did come together".
"It's a relief. I'm pleased for my family". This is what I've wanted to be achieving. "We have plenty of options for him, now". This is at the top [of my achievements]. It was a very good run though and I'm delighted.
While this was a first Eclipse for Murphy, who is still growing in stature by the year, it was a third for John Gosden in the last seven runnings, following wins with Nathaniel in 2012 and Golden Horn in 2015.
Dunlop trained more than 3,500 winners. "That gives me confidence before you start". They kept me wide, but John said whatever happens don't get sucked in.
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"My horse has caused very little interference, if any, and clearly he was the best horse in the race".
He added: "Roaring Lion has grown up through the season and he felt great today".
"The tactics were clever", he said.
He said: 'I knew I was on the best horse in the race and had to get it right. I'd say we can go back (to a mile) any time he wants.
Roaring Lion (7/4 favourite), trained by John Gosden, passed the post in front by a neck under Oisin Murphy from Aidan O'Brien's charge ridden by his son, Donnacha. Paddy Power make him a 4-1 chance, from 11-2.
Gosden said: "It was very sad that the Derby victor wasn't here as it would have been a phenomenal race if you had the Guineas and Derby winners and us".
Saxon Warrior holds entries over various distances in races such as the King George VI And Queen Elizabeth Stakes, the Sussex Stakes, the Juddmonte International and the Irish Champion Stakes. I'm sure we will see the second (Saxon Warrior) there and with some luck, we will see Masar there.