Deimos

Deimos was a Goa'uld, the 'son' of Ares and 'brother' to Phobos. He served under his father, at least as far back as Ma'chello's rebellion on the planet Dendred, where he was known to have operated a ha'tak mothership. Agents of Ma'chello, having swapped bodies with some of Deimos' Jaffa, managed to gain access to Deimos' ha'tak where they proceeded to sabotage the ring transporters on board; no longer would they produce a harmless stream of energy which passed between sets of rings, but they would now disintegrate any matter in their path. Ma'chello's agents simply left their trap in place until a pre-arranged time when they activated their trap, destroying Deimos' ha'tak, along with that of his brother which they had also sabotaged, in a fiery explosion. They thought that this had killed both of Ares' 'sons'.

Both Deimos and his brother somehow managed to survive the explosions, however, and eventually returned to Earth. Phobos eventually tried to usurp Ares as the Greek god of war but was betryaed by Deimos, and instead banished to the graveyard world of Kar'tek; what happened to Deimos after this is unknown.