On 9 November 1966, after The Beatles' final tour and just after he had finished filming How I Won the War, Lennon visited an art exhibit of Yoko Ono's at the Indica gallery in Mason's Yard, London. Lennon began his relationship with Ono in May 1968 after returning from India.
Cynthia filed for divorce later that year, on the grounds of John's adultery with Ono which was evidenced by the latter's pregnancy and miscarriage of their son. Lennon and Ono became inseparable, even during Beatles sessions.
On November 8, the couple was granted the divorce. Cynthia (in a much later reflection on their divorce) had this to say: "...John had at last found his soul mate...Yoko did not take John away from me, because he had never been mine. He had always been his own man and had always done his own thing, as I had learned to do. I had grown to be independent of John. I was shocked, shattered and lost, but not weak."
The press was unkind to Ono — writing unflattering articles about her, with frequently racist overtones — and one called her "ugly". This angered Lennon, who said that there was no John and Yoko, but they were one person; "JohnandYoko". Yoko's constant presence in the studio led to tension within The Beatles during the White Album recordings in 1968.