Pope Paul VI hands Orthodox Metropolitan Meliton of Heliopolis a decree during the December 1965 session of the Roman Catholic Ecumenical Council in Vatican City. The decree cancels excommunications that led to the break between the Roman and Orthodox churches nine centuries before.

Fifty years ago, Pope John XXIII shocked the world when he created the Second Vatican Council. Known as Vatican II, the council called thousands of bishops and other religious leaders to the Vatican, where they forged a new set of operating principles for the Roman Catholic Church. Today, the council's legacy is at once celebrated and carefully managed.

When Pope John XXIII announced the creation of the Second Vatican Council (also known as Vatican II) in January 1959, it shocked the world. There hadn't been an ecumenical council — an assembly of Roman Catholic religious leaders meant to settle doctrinal issues — in nearly 100 years.

"Many people maintained that with the definition of papal infallibility in 1870, councils were no longer needed. So it was a big surprise," Georgetown University professor Rev. John W. O'Malley says.

The council called between 2,000 and 2,500 bishops and thousands of observers, auditors, sisters, laymen and laywomen to four sessions at St. Peter's Basilica between 1962 and 1965. Cultural changes in the aftermath of World War II spelled a need to reconsider church practices. These meetings did just that — 16 documents in total came out of it, laying a foundation for the church as we know it today.

O'Malley says a theme of the documents was reconciliation. In keeping, they allowed for Catholics to pray with other Christian denominations, encouraged friendship with other non-Christian faiths, and opened the door for languages besides Latin to be used during Mass. Other new positions concerned education, the media and divine revelation.

Most prominently, says Xavier University's Peter A. Huff, the council highlighted the church's willingness to operate in the contemporary realm.

"Prior to this time, the church had been almost seen as a fortress, very much concerned about its own internal stability and integrity and engaging the world in terms of missionary activity," Huff says. "Pope John wanted to reinforce that missionary mandate, but he also wanted to create an environment of dialogue, where the church would engage in all the forces of the modern world."

Today, the council is credited with essentially shaping the modern Catholic Church. But some Catholics still look fondly on the old days, and others are concerned about the interpretation of the council's legacy. Pope Benedict, for one, is careful to emphasize that Vatican II was not a condemnation of the pre-council church.

"He wants to see Vatican II as a council of reform but a council that's in continuity with the Catholic past that came before it," Huff says.

Fifty years since the council, O'Malley says that most young Catholics know little about this revolutionary period. But he hopes the anniversary will change that.

"It's passing from experience and memory into history. You have to pass on the word to the next generation," he says.

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