I want to know the answer to the following question:
Who visited the Vatican in May of 1973 in an effort to negotiate Orthodox and Catholic relations?
All the background I'm provided with is that "It produced the Catholic-Orthodox Joint declaration of 1965, which was read out on 7 December 1965, simultaneously at a public meeting of the Second Vatican Council in Rome and at a special ceremony in Istanbul.". Is that enough to answer the question?
Answer: no