Earldom of Buchan

• Ruling Houses
• 

  House of Comyn

• 

  House of Beaumont
  Henry de Beaumont

• 

  House of Stewart
  Alexander Stewart

• 

  House Stewart of Albany

• 

  House of Borssele
  Wolfert VI van Borselen

• 

  House Stewart of Buchan

• 

  House of Douglas

• 

  House of Erskine

• 

  House Erskine of Cardross