Pope Francis prayed for peace in Ukraine and Syria as he celebrated Easter Mass on Sunday at the steps of St. Peter's Basilica in Rome.
The pope, head of the Roman Catholic Church, prayed for all those involved in the conflict in Ukraine to "make every effort to prevent violence." In Syria, he prayed for "peace that is long awaited and long overdue."
He also called for an end to terrorist acts in Nigeria, violence in Iraq, and success in peace negotiations between Israelis and Palestinians.
Pope Francis spoke to thousands of people gathered in St. Peter's Square for the annual celebration of the resurrection of Jesus, one of Christianity's most prominent holidays.
In Ukraine, Prime Minister Arseniy Yatsenyuk attended church with his family and called on Ukrainians to unite and "resurrect."
Christians also packed churches in Iraq and Syria to pray for peace.
British royalty - the Duke and Duchess of Cambridge - attended Easter service in Australia at Saint Andrew's Anglican cathedral in Sydney.
Before they left, William and Kate signed the First Fleet Bible, a King James edition the first fleet of European settlers and convicts brought to Australia in 1788.
The Bible had been previously signed by Queen Elizabeth, Prince Charles and Princess Diana.
At an Orthodox Christian Easter service in troubled Ukraine, which is locked in conflict with Russia, Kyiv Patriarch Filaret called Russia an "enemy" whose attack on Ukraine is doomed to fail.
Russian President Vladimir Putin and Prime Minister Dmitry Medvedev attended a Russian Orthodox Easter service at the Cathedral of Christ the Savior in Moscow where Patriarch Kirill led prayers for Russians in Ukraine and called for an "end to the designs of those who want to destroy Holy Russia."
Worshippers gathered Saturday night in Bethlehem for the traditional Easter vigil at the Church of Saint Catherine, adjacent to the Church of the Nativity.
The church is one of the most visited shrines of Christianity and stands above the grotto where Christians believe Jesus was born.