|God of Death|
|Lieutenant of Pluto|
|Reaper of Souls|
|Family||Nox (mother) |
|Greek/Roman form||Thanatos (Greek)|
|Appearances||The Son of Neptune (mentioned)|
Letus (also known as Mors) is the Roman counterpart of Thanatos. 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).
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 person's soul, or shade, down to the Underworld's gate.
While Letus is the Roman form of Thanatos, Hazel explains that the Roman Legion refer to him by the Greek name Thanatos. This is because Letus is a god of death, so they allow him to stay Greek. Thanatos never appears in his Roman form.