사대명문

The Four Great Houses (四大名門(よんだいめいもん)) are Erebonia's four greatest noble families. Each House upholds the highest of noble traditions and influence over the Imperial provinces entrusted to them by the emperor.

Organisation

Bold indicates most recent official leader.

House Cayenne

• 크로와르 드 카이엔: Former lord and leader of the Four Great Noble Houses who holds the title of Duke, he was also the ruler of the Lamare Province before his arrest. He was revealed to be a descendant of the Arnor Family from the line of the removed Royal family member, Orthros Reise Arnor. Like his ancestor, he was removed from power after the Erebonian Civil War's end.
  
• Mildine Juzalith de Cayenne: Daughter of the late Duke Alfred de Cayenne, she was confined to St. Astraia Girls' School by her uncle Croire after her parents' death. With Croire's arrest and the backing of the other Great Houses, she was appointed as the heir apparent to House Cayenne. She currently leaves most official matters in the hands of her granduncle, 빌헬름 발라드, as she finishes her education at Thors Branch Campus.

House Albarea

• 헬무트 알바레아: Lord of the Kreuzen Province who holds the title of Duke. He was arrested by his second son for ordering the pillaging of Celdic.
• 루퍼스 알바레아: The first-born son of the duke and a member of Thors Military Academy's board of directors. He is the primary leader of the Ironbloods, and was tasked to take out the Noble Alliance from within.
• 유시스 알바레아: The duke's illegitimate second son and a student of Thors Military Academy's experimental Class VII. Following the Erebonian Civil War, he took up the role of Kreuzen's new lord after his father's arrest.
  

House Rogner

• 게르하르트 로그너: Lord of the Nortia Province who holds the title of Marquis.
• 하이델 로그너: The marquis's younger brother who temporarily held the position of the 라인폴트 그룹's director following the Noble Alliance's hostile takeover. Following the infiltration of the 라인폴트 그룹 building by Class VII, he was removed from the position and arrested.
• 안젤리카 로그너: The marquis's rebellious daughter and a student of Thors Military Academy's Class I.
  

House Hyarms

• 페르난드 하이암즈: Lord of the Sutherland Province who holds the title of Marquis.
• 패트릭 T. 하이암즈: The third-born son of Marquis Hyarms and a student of Thors Military Academy's Class I.
  

Gallery

• 
  The four great house's domains of Erebonia.
• 
  The capital cities of each Great House; Bareahard, Ordis, Saint-Arkh and Roer.