The leader of the Mombasa Republican Council, a separatist group based in southern Kenya, has been charged with holding an illegal gathering and planning to breach the peace.
Omar Mwamnuadzi was arrested with 11 other members of the MRC during a police raid on his home and denied the charges in a court appearance on Wednesday.
Although the Kenyan High Court lifted the ban on the group in 2012, the government still considers the MRC to be a terrorist group.
The MRC complains of government marginalisation of the ethnic groups living along the coast and calls for the independence of the area which used to be the former Coast province.
The group, which claims followers from Muslim and Christian communities, has denied government claims that it is forging links with Al Shabab in Somalia.