Marianne Faithfull died Thursday in London at age 78. The singer, actress and "It" girl of 1960s London inspired — or wrote — numerous Rolling Stones songs.

Marianne Faithfull, who has died at the age of 78, was in a relationship with Rolling Stones frontman Mick Jagger for four years in the 1960s - but their romance was far from straightforward

"I am so saddened to hear of the death of Marianne Faithfull," Jagger wrote on Instagram, alongside several photos of the singer over the years, some of which also featured the rocker himself. "She was so much part of my life for so long.

Marianne Faithfull, who died today at 78, was crucial to the story of the Rolling Stones. Discovered by producer Andrew Loog Oldham at a party for the band, she later dated Mick Jagger from 1966 to 1970 and inspired him to write songs including “Wild Horses” and “You Can’t Always Get What You Want.

Rolling Stones frontman Sir Mick Jagger has paid tribute to “wonderful friend and beautiful singer” Marianne Faithfull following her death aged 78. He was joined by bandmates Ronnie Wood and Keith Richards,