In May 1857, when Rainilaiarivony was 29 years old, Lambert consequently invited Prince Radama, Rainivoninahitriniony, Rainilaiarivony and a number of other officers to conspire with him in a plot to overthrow Ranavalona.
Pada Mei 1857, ketika Rainilaiarivony berusia 29 tahun, Lambert mengajak Pangeran Radama, Rainivoninahitriniony, Rainilaiarivony, dan sejumlah perwira lainnya untuk bersekongkol menggulingkan Ranavalona.