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Hundreds of letters and photographs that tell the story of Pope John Paul II's close relationship with a married woman, which lasted more than 30 years, have been shown to the BBC.
The letters to Polish-born American philosopher Anna-Teresa Tymieniecka had been kept away from public view in the National Library of Poland for years.
The documents reveal a rarely seen side of the pontiff, who died in 2005.
There is no suggestion the Pope broke his vow of celibacy.
None of the letters reveal a sexual relationship, but it's kinda odd for a Cardinal (or anyone) to be taking a married woman on walks and trips together.
In a letter dated 10 September 1976 he wrote: "Already last year I was looking for an answer to these words, 'I belong to you', and finally, before leaving Poland, I found a way - a scapular. The dimension in which I accept and feel you everywhere in all kinds of situations, when you are close, and when you are far away."
After becoming Pope he wrote: "I am writing after the event, so that the correspondence between us should continue. I promise I will remember everything at this new stage of my journey."
Her letters to him are still unseen...
