Pluto

Pluto was the god of the underworld in the Archadian Pantheon. Being "at the throne of Pluto" is a euphemism for being dead.

Tristitiis mittimus mortuam Pluto in nigram manum tuam Tibi iudicanti ultimo eam Sic meritam requiem perpetuam Offeres Rex Infernam Ei quae est absentiam

Sadly we send the dead one To your black hand, Pluto For you to pass the last judgement About deserved eternal peace Which you offer, Underworld King To she who is departed