Bahamut

Bahamut's Palace.
Accounts differed in the descriptions of Bahamut's legendary palace. In the oldest records, it was described as a palace made of crystal. In the more modern accounts, the palace was described as a wondrous, glittering fortress with windows made from gems set in silver and gold, walls with inlaid copper and ivory on the inside, and platinum on the outside, and floors of beaten mithral. It was said to lie on a mountain top, with strange clouds obscuring everything below the palace. A wondrous mithral bridge disappearing into the clouds led to the main gates. Regardless of the source, all accounts stated that the castle was built entirely from Bahamut's enormous treasure hoard (as well as of bones of thousands of would-be thieves) and that it reflected the eternal light of Celestia like a beacon on the horizon.
Bahamut's Palace was also connected to the Elemental Plane of Air by four portals named after the four winds, each guarded by a warden archon. The guardian of the gate to the North Wind was Yonel, the guardian of the gate to the South Wind was Kerkhoutha, the guardian of the gate to the West Wind was Moriel, and the guardian of the gate to the East Wind was Ruhiel.
Besides Bahamut and the warden archons, Bahamut's Seven Gold Wyrms lived in the Palace, watching over Bahamut's hoard and helping to protect his Palace when they were not traveling or on some mission. Bahamut's exarch, Kuyutha, also trained an order of Dragonborn knights in Bahamut's Palace.
In the past, good-aligned petitioners, clerics, and paladins often took pilgrimages to his castle, but Bahamut had stopped receiving visitors after the destruction of the Nexus in the Feywild.

The Seven Virtues and the Seven Vices, Bahamut's Will, The Book of Dragons.

A white dragon's profile on a blue field, often in the shape of a shield. The number seven.

Bahamut's dogma was based on justice, nobility, protection, and honor. He taught his followers to always uphold the highest ideals of honor and justice; to be constantly vigilant against evil and to oppose it from all fronts; and to protect the weak, liberate the oppressed, and defend just order. Bahamut advocated a "greater justice" that included fighting against evil and toppling oppressive regimes. He also liked to reward strength of purpose and character in his followers.
Bahamut's teachings were often boiled down to Seven Virtues and their opposing Seven Vices. These were: Chastity and Lust, Temperance and Gluttony, Charity and Greed, Diligence and Sloth, Patience and Wrath, Gratitude and Envy, Humility and Pride.