Letus

Letus (Mors), is Thanatos' Roman aspect. As Letus, he becomes more disciplined, militaristic, and warlike. In ancient Roman myth and literature, Mors is the personification of death. Letus' antithesis is personified as Vita (Life).

History
In one story, Hercules fought Mors in order to save his friend's wife. In other stories, Mors is shown as a servant to Pluto, ending the life of a person after the thread of their life has been cut by the Parcae, and of Mercury, messenger to the gods, escorting the dead persons soul, or shade, down to the underworld's gate.

The Son of Neptune
Letus was mentioned in The Son of Neptune by Hazel during the meeting.

Trivia

 * Letus is the Latin word for Death.
 * Depictions of the Crucifixion of Christ sometimes show Mors standing at the foot of the cross.
 * Hazel claims that when it comes to Death, the Romans let him stay Greek (Thanatos).