(Adds defence, prosecution, Liberia reactions, context)
By Thomas Escritt
THE HAGUE, Sept 26 (Reuters) - Charles Taylor lost his appeal against a warcrimes conviction on Thursday, judges confirming a 50-year jail term against the former Liberian president for encouraging rebels in Sierra Leone to mutilate, rape and murder victims in a decade-long civil war.
Presiding judge George Gelaga King said Taylor had aided and abetted crimes committed by Revolutionary United Front and Armed Forces Revolutionary Council rebels, advising and assisting them while knowing well the kinds of crimes they were committing.
"Their primary purpose was to spread terror. Brutal violence was purposefully unleashed against civilians with the purpose of making them afraid, afraid that there would be more violence if they continued to resist," he said.
"Governments and the international community were also afraid that unless the RUF's and the AFRC's demands were met, thousands more killings, mutilations, abductions and rapes of civilians would follow."
Taylor, 65, smartly dressed in a crisp suit, sat impassively throughout the reading of the appeals judgment at the U.N.-backed Special Court for Sierra Leone in The Hague.
He is the first head of state to be convicted of war crimes by an international court since the Nuremberg trials of Nazis after World War II.
Taylor was also found guilty of crimes against humanity committed during the 11-year conflict in Sierra Leone, which cost some 50,000 lives and left tens of thousands of people mutilated, their fingers, hands or limbs chopped off.
Prosecutors said he used the proceeds from so-called blood diamonds mined in the conflict zone to finance his activities, which included advising and helping the rebels.
"This verdict shows no person, no matter how powerful, is above the law," said Brenda Hollis, the court's prosecutor.
"The conviction of those responsible for crimes committed during Sierra Leone's conflict has brought some measure of justice for the tens of thousands of victims," said Stephanie Barbour of Amnesty International.
But Morris Anyah, Taylor's lead defence lawyer, said Taylor would not have been convicted if he had had a powerful ally.
"If Charles Taylor had had a friend among the permanent members of the U.N. Security Council, this case would not have had the traction it has had," he said, adding that Taylor had received the final verdict with great stoicism.
During his four-year initial trial, judges heard accounts from Sierra Leone civilians who had been mutilated by rebels or who had seen their close relatives murdered.
They also heard evidence from the supermodel Naomi Campbell, who was questioned about blood diamonds that Taylor allegedly sent to her hotel room. She described them as looking like "dirty pebbles."
Britain has agreed Taylor can serve his sentence at one of its maximum security prisons but Anyah said Taylor hoped to serve his term in Finland, Sweden or Rwanda - the other three countries which have enforcement agreements with the court.
In Liberia, Taylor's supporters denounced the court and its permanent successor, the International Criminal Court.
"This is complete international gangsterism," said, Cyril Allen, former secretary general of the National Patriotic Party. "The ICC was set up for Africans, to intimidate them and get their resources."
Thursday's ruling comes at a time when the very idea of international courts is coming under fire across Africa. The ICC has been accused of neo-colonial meddling in Kenya as it pursues cases against the country's president and deputy president.
Several African states are considering withdrawing from the ICC, which has only ever prosecuted Africans.
(Reporting By Thomas Escritt; additional reporting by Alphonso Toweh in Monrovia; Editing by Jon Boyle)