Gremory

The Gremory  Clan is one of the remaining Devil Clans of the 72 Pillars Pillars and one of the highest-ranking (ranking at Duke) and famous Devil families. The next head is Rias Gremory, followed up by Millicas Gremory.

Summary
The house that produced the current "Lucifer", members of the Gremory Clan are characterized with their red hair color and their powerful Demonic Powers. The Gremory Clan are beings with extraordinary affection among the Devils. As such, they do not discriminate themselves with their servants. The Gremory Clan has a territory that is about the same area of Honshu in Japan, and also has a vast number of castles for its kin. A very rich territory, it also has a developed industry.

Gremory Mansion
The Gremory Mansion is home to all the family members of the Gremory clan and it serves as the place of ruling. The layout of the mansion's outside is a quadrangle with a courtyard in the middle. Outside at the entrance is a fountain with a circular flower bed surround it, with many gardens in the surrounding areas.

Symbol
The clan symbol of the Gremory consists of a rose encased in a circular shape and is crimson in color.

Powers
The youngest members of the Gremory Clan have all inherited the Power of Destruction ability of the Bael family. Because of this, it is presently unknown what magic ability Zeoticus Gremory and their ancestors possessed, but it is known that the Gremory Family are born with powerful Demonic Powers and have superior control of it as shown by Sirzechs who inherited both the Gremory and Bael's traits.

Members
The currently known members of the Gremory Clan are Zeoticus Gremory the current head of the Gremory Clan, his wife, Venelana Gremory who came from the Bael Clan, their children Sirzechs Lucifer and Rias Gremory, as well as Sirzechs' wife, Grayfia Lucifuge, and their son, Millicas Gremory. Issei Hyoudou is viewed as a member of the clans by the staff of the Gremory household and the members of the clan to be a member. There are also Sirzechs and Rias' unknown grandparents who have retired and are quietly living in the Gremory's territory.

Trivia

 * In demonology, Gremory (also Gemory, Gamory, Gomory) is a strong Duke of Hell who governs 26 legions of demons. He tells all things past, present, and future, about hidden treasures, and procures the love of women, young and old (but especially maidens). He is depicted as appearing in the form of a beautiful woman with the crown of a duchess tied around his waist, and riding a camel.
 * Rias stated that the mountain in which Issei trained with Tannin was going to be called Mt. Issei.
 * The Gremory Clan also have an important ruin that has been passed down from generation to generation called the Ruins of Connection.
 * The females in the Gremory Clan seem to have the habit of pinching their husband/lover's cheek whenever they do something embarrassing or silly. This applies to Rias, Venelana, and Grayfia.
 * The only Gremory males who don't have a harem are Sirzechs, due to being a Maou, and Millicas, due to his age.