Two sons of Muammar Gaddafi, the late Libyan leader, are due to appear in court in Tripoli on Monday.

They are being tried alongside dozens of other senior members of the country's former regime on multiple charges, including war crimes.

Saif al-Islam Gaddafi was caught in November 2011, six months after being indicted for crimes against humanity by the International Criminal Court.

Saadi Gaddafi escaped to Niger at the end of the revolution, but the new Libyan government successfully applied for his extradition.

Investigators have released few details about the case, but it is understood that there are more than 200 witnesses and a vast amount of written evidence.

Al Jazeera's Andrew Simmons reports from Tripoli.