Apollonius au Valii-Rath, aka The Minotaur of Mars, is a character in the Iron Gold series and one of Tactus au Rath's older brothers.

Being of house Rath, Apollonius is of Middle-Eastern descent. He became one of the Jackal's Boneriders along with his younger brother Tharsus.

After the Fall of Octavia and The Jackal, the two remaining Rath brothers fled to Venus and teamed up with the Ash Lord. Four years later, Apollonius lead an attack on the Luna Citadel under command of the Ash Lord to kill The Reaper and his family, but quickly after he and his team lands, the Ash Lord reveals that it was just a trick to be rid Apollonius. Despite this, Apollonius leads the attack anyway, and almost succeeds, and is only defeated by Darrow.

Darrow claims that Apollonius' face looming out of the darkness with Howler blood on his face still haunts him at night.

Apollonius was imprisoned in Deepgrave after being captured by Darrow during the time after Morning Star and sentenced to life in prison in lieu of the death penalty.