The gas giant of a planet the god was named after represents the amount of power placed under the king of the gods. No god was higher than him and his ego reflected this.
Mars was second only to Jupiter in the Roman Pantheon as he was the war god. The Romans, a society that adored war, immediately vaulted him into a position of high respect and honor.
Romans hated sea travel and the mystery that came with the depths, thus Neptune was genuinely despised, yet respected by the society.
Bellona has no Greek form. She was the goddess of war for the Romans and thus held high regard.
Wife of the King of the gods. She had quarrels with the maidens of Jupiter and their offspring. The most namely of which would be Hercules.