The keeper of everything the earth takes back, and everything it gives up.

Pluto, whom the Romans also called Dis Pater, the rich father, rules the world below: the honored dead, and with them every wealth the ground holds, from seed grain to silver. With Proserpina beside him he was honored at the Secular Games at an underground altar in the Campus Martius, uncovered for the rites and buried again after. He is not death itself; he is the household the dead are received into.

The ninth planet took his name in 1930, at the suggestion of an eleven year old.