The pope's butler, Paolo Gabriele, is charged with 'aggravated robbery' for his role in the Vatileaks case. If found guilty he could face up to six years in prison.
His alleged accomplice, Claudio Sciarpelletti, who worked as a computer programmer in the Vatican's Secretariat of State, is accused of playing a role.
The hearing will begin at 9.30 a.m. and end at 12.30 p.m. Eight journalists will be allowed inside, but no photographs, video or recording devices of any kind, will be allowed.