In this Friday, June 17, 2016 photo released by Holy and Great Council, leaders of ten Orthodox churches pose for a family picture at the Orthodox Academy of the Greek island of Crete, from left to right, Patriarch Sawa leader of the Orthodox Church of Poland, Archbishop of Cyprus Chrysostomos, Patriarch of Serbia Irinej , Patriarch of Alexandria Theodoros , Ecumenical Patriarch Bartholomew I, Patriarch Theophilos of Jerusalem, Patriarch of Romania Daniel , Archbishop of Greece Ieronymos , Archbishop of Albania Anastasios and Archbishop Rastislav of the Czech Lands and Slovakia. Orthodox Christian leaders meeting for a historic council aimed at promoting unity have made a last-minute appeal to the Russian Orthodox Church and three others to attend the first such gathering in more than a millennium. (Holy and Great Council via AP)

CAIRO (AP) — Orthodox Christian leaders meeting for a historic council aimed at promoting unity made a last-minute appeal Friday to the Russian Orthodox Church and three others to attend the gathering, the first such meeting in more than a millennium.

A spokesman for Istanbul-based Ecumenical Patriarch Bartholomew I said the leaders of 10 out of the 14 Orthodox churches that were supposed to convene on the Greek island of Crete will seek to resolve the issues that made the four churches decide not to attend.

"It will proceed but they want their brothers with them and (now) make a plea even at the 11th hour" for them to attend, said the Rev. John Chryssavgis.

The week-long Holy and Great Council is starting on Sunday. The four churches pulled out over the past two weeks after disagreements over procedural and some doctrinal issues. Except for Russia, the include Bulgaria, the Damascus-based Antioch Patriarchate and the Georgian Orthodox Church.

The meeting was meant to bring together the leaders of the 14 independent Orthodox churches to promote unity among the world's 300 million Orthodox Christians.

Orthodox church leaders haven't held such a meeting since the year 787, when the last of the seven councils recognized by both Orthodox and Catholics was held. The "great schism" then split the Roman Catholics and the Orthodox in 1054 amid disputes over the Vatican's power.

The idea for the synod first emerged in the 1920s but preparations began in 1961. Many preparatory meetings have been held since, the last in Geneva.

But after the four churches pulled out, it's unclear how much the gathering can accomplish.

Later Friday, Russian Patriarch Kirill sent a message to the leaders in Crete, confirming his church would not attend and saying he considered the gathering in Greece as a preparation session ahead of a truly united Holy and Great Synod.

"The churches, both those who have decided to go to Crete and those who have refrained from it, made their decisions in good conscience, and for this reason we must respect the position of each of them," he said.

"I trust that if there is a good will, the meeting in Crete can become an important step toward overcoming the present differences," Kirill added. "It can make its own contribution to the preparation of that Holy and Great Council which will unite all the Local Autocephalous Churches without exception."___

Associated Press Writer Vladimir Isachenkov in Moscow contributed to this report.