Caput Mundi is the capital world of the Te'an Empire.
Members of the Ennead, the Imperial Commander, and members of the Order of Theikos all live on Caput Mundi. The planet is dotted with many cities, each with dozens to hundreds of planetary defense towers, capable of taking on hostile assault fleets.
While being the seat of Te'an power it is not their most important planet. That rite belongs to their homeworld, Mors Terra.