Answer
Gerousia, the traditional Spartan leadership that Lysander dared to challenge, comprised a council of elders serving as advisors and supervisors of the Spartan kings. This influential body's authority spanned military, domestic, and foreign affairs. Lysander, a prominent Spartan naval commander and politician, sought to undermine the Gerousia's influence and centralize power within his grasp, marking a significant shift in Spartan governance.