Kenyan Deputy President William Ruto goes on trial Tuesday at the Hague for alleged crimes against humanity.
Ruto left Nairobi to travel Monday to the International Criminal Court, accompanied by several supporters.
The deputy president is accused of helping to orchestrate post-election violence in 2007 and 2008 that killed more than 1,000 people and displaced more than a half-million from their homes.
He is being tried alongside radio station executive Joshua arap Sang. Both are expected to plead not guilty to the charges.
Prosecutors are scheduled to call 40 witnesses during the trial, with some appearing anonymously because of safety concerns.
The trial chamber consists of three judges, one each from Nigeria, the Dominican Republic and the Czech Republic.
Kenyan President Uhuru Kenyatta, who is also accused of orchestrating post-election violence, is to go on trial November 12.
On Thursday, Kenya's parliament passed a motion calling for the country to withdraw from the ICC. The court said the cases would continue despite Kenya's withdrawal, which would take about a year to officially complete.