Congolese war crimes suspect Bosco Ntaganda has arrived at the International Criminal Court's detention centre in The Hague.
Mr Ntaganda was flown to the Netherlands from Kigali in Rwanda to face war crime charges.
He turned himself in at the US embassy in the Rwandan capital earlier in the week.
The Congolese warlord is known as "the Terminator" and is accused of murder, rape and other atrocities.
Mr Ntaganda walked off the street and gave himself up after a 15-year career that spanned a series of Rwandan-backed rebellions in the east of the Democratic Republic of Congo.
He was most recently a commander in the M23 rebel movement, but his position weakened after the group split in two.
His removal from the conflict creates an opportunity to secure a peace agreement to end the year-old rebellion in a region dogged by conflicts.
Mr Ntaganda's surrender was the first time an ICC suspect voluntarily surrendered himself to the court's custody.
He asked stunned US officials at the embassy to be transferred to the court.
He will face charges of recruiting child soldiers, murder, ethnic persecution, sexual slavery and rape during the 2002-2003 conflict in northeastern Congo's gold-mining Ituri district.
His whereabouts had been unknown after hundreds of his fighters fled into Rwanda or surrendered to UN peacekeepers last weekend
The split followed their defeat by a rival faction of M23 rebels in the mineral-rich eastern Congo.
An independent research and educational organisation working in East Africa, the Rift Valley Institute, said: "Bosco thought his choice was the ICC or probable death."