There was a constant danger of servile insurrection, which had more than once seriously threatened the republic. The 1st century BC Greek historian Diodorus Siculus wrote that slaves sometimes banded together to plot revolts. He chronicled the three major slave rebellions: in 135–132 BC (the First Servile War), in 104–100 BC (the Second Servile War), and in 73–71 BC (the Third Servile War).