A planet's domicile is the zodiac sign over which it has rulership, and the rulers of Pisces, or those associated with Pisceans, are Jupiter, Neptune, and the moon. In esoteric astrology, Venus was considered the ruler of Pisces, and prior to the discovery of Neptune in 1846, Jupiter was said to rule Pisces. Neptune is mostly considered the ruling planet of Pisces today because of the association with the Roman god of water and the sea, Neptune. The detriment, or the sign "opposite" to that which is deemed the ruling planet, is Mercury. Venus is exalted in Pisces, while both Pluto and Mercury fall in Pisces.