Roger Colbert was the temporal secretary to the Abbot of Amboise. He was part of the conspiracy to assassinate Admiral Gaspard de Coligny in August 1572. Anne Chaplet heard Colbert and the Captain of the guard talking of a conspiracy against the Huguenots.
He later told the Abbot and Marshal Tavannes that the assassination attempt on de Coligny had failed and de Coligny was only wounded. When Tavannes had the Abbot killed for his failure, and the Huguenots blamed, Colbert pointed out Steven Taylor to a crowd of angry Catholics, who then chased Steven, thinking he killed the Abbot. (TV: The Massacre of St Bartholomew's Eve)