Mehmet Ali Agca, a Turk, left John Paul critically injured after firing several shots in the failed assassination attempt in St. Peter's Square on May 13, 1981.
The former pope forgave Agca, once a member of a Turkish far right group known as the Grey Wolves, and went to meet him in 1983 in the Rome prison where he had been sentenced to life imprisonment for the attack.
Agca called the Italian daily la Repubblica on Saturday to announce he had arrived in the Vatican, his first visit since the assassination attempt and exactly 31 years after John Paul met him in prison.
The visit was confirmed to Reuters by Father Ciro Benedettini, the Vatican's deputy spokesman, who said Agca stood for a few moments in silent meditation over the tomb in St. Peter's Basilica before leaving two bunches of white roses.
Agca, 56, was pardoned by Italy in 2000 and extradited to Turkey where he was imprisoned for the 1979 murder of a journalist and other crimes. He was released from jail in 2010.
The attack against John Paul, who died in 2005, has remained clouded by unanswered questions over who may have been behind it. An Italian investigative parliamentary commission said in 2006 it was "beyond reasonable doubt" that it was masterminded by leaders of the former Soviet Union.
The Vatican on Saturday gave a cool response to Agca's request to meet with Pope Francis. "He has put his flowers on John Paul's tomb; I think that is enough," Vatican spokesman father Federico Lombardi told la Repubblica.
(Reporting by Philip Pullella; Writing by Gavin Jones; Editing by Stephen Powell)
