The hierarchy of the Wizengamot:
The Most ancient and Imperial house of Pendragon:
The Most ancient and Imperial house of Pendragon is a royal house that originated in the 2nd Century. If at all an heir emerges returns the heir requires at least 75% of the Wizengamots's vote to take up the throne and become the King of Magical England. The Pendragon line consisted of Magicals and Non-Magicals. The most notable member is Arthur Pendragon. Their family magicks consists of Light magic.
The most ancient and most revered houses:
These houses were knighted by Arthur Pendragon and helped fight Camelot against evil forces. After the fall of Camelot the remaining members of these houses grouped together and formed what is known today as the Wizengamot. These families have access to their family magicks and have affinities. Their family libraries are the oldest and the most diverse. They are of equal standing. These houses have 7 votes in the wizengamot.
The most ancient and most revered houses are:
Emrys: Most notable member is Merlin Emrys. Their family magic mainly consists of the magicks of Dragonlords. The family ended when Merlin gave his magic and life to keep Camelot safe. Rumor has it that Merlin cast a spell that lets his magic to live on and find his heir.
Le-fay: Most notable member is Morgana Le-fay. The family line continues through its daughter line Greengrass (Celestine Le-fay married Victor Greengrass in 1289). Their family magicks mainly consists of Dark curses and Olde magicks.
Gryffindor: Most notable members are Godric Gryffindor (founder of Hogwarts) and Darwin Gryffindor (Knight of Camelot). The family line branched into the Potters and The Bones. They are famous because they produced Battle Mages than any other family line. Gryffindor's family magic is mainly based on Battle Magic. A part of Gryffindor's family magic is lodged in the ward stone of Hogwarts to support the offensive wards of Hogwarts.
Hufflepuff: Most notable members are Gaius Hufflepuff (Chief Physician of Camelot) and Helga Hufflepuff (founder of Hogwarts). The family branched into the Longbottoms (Ciara Hufflepuff married Augustus Longbottom in 1197) and the Smiths. They are famous for their Healing abilities. Their family magic consists of Healing Magic. A part of Hufflepuff's healing magic is lodged in the Hogwarts ward stone to support the repairing and healing wards of Hogwarts.
Ravenclaw: Most notable member is Rowena Ravenclaw (founder of Hogwarts). The family continues through the Lovegood line (Celestina Ravenclaw married Albert Lovegood). Their family is famous for their Spell crafters. Their family magic consists of Spell crafting and Runes and Blood magic. A part of Ravenclaw family magic is lodged in the ward stone of Hogwarts to support the Protective wards of Hogwarts.
Slytherin: Most notable members are Salazar Slytherin (founder of Hogwarts) and Cyrus Slytherin (Knight of Camelot). The family branched into the Gaunt line (Addison Slytherin married Cygnus Gaunt in 1286). They are famous for their wards and healing in Parseltongue. Their family magic includes parselmagic and Blood magic. A part of Slytherin's family magic is lodged in the Hogwarts ward stone to support the structural wards of Hogwarts.
Peverell: Most notable members include Antioch Peverell, Cadmus Peverell, Ignotus Peverell (Famous Necromancers and the the three brothers in the The tale of three brothers) and Faust Peverell (a famous necromancer and soul magic practitioner). The family branched into the Gaunts (Cadmus Peverell II married Sabrina Gaunt in 1134) and Potters (Iolanthe Peverell married Hardwin Potter in 1099). Their family magic consists of Necromancy and Soul magic. They are famous for their necromantic powers.