A total of 56 Dread Emperors or Empresses of Praes have been mentioned in A Practical Guide to Evil.
If you see a ruler is missing, or any other mistakes, feel free to add them to this page!
The following are listed in alphabetical order:
Dread Emperor Abominable The First - the Thrice-Struck
Dread Emperor Atrocious The First
Dread Emperor Benevolant The First
Dread Emperor Bilious The First - the Beast
Dread Emperor Callous The First
Dread Empress Dismal The First
Dread Emperor Foul I - the Frugal
Dread Empress Foul II - the Forthright
Dread Emperor Foul III - the Linguist
Dread Emperor Heinous The First
Dread Emperor Imperious The First
Dread Emperor Inimical The First
Dread Emperor Iniquitous The First
Dread Emperor Irittant The First - The Oddly Succesfull
Dread Empress Malevolent I - the Unhallowed
Dread Empress Malevolent III - the Pithy
Dread Empress Malicia The First
Dread Emperor Malignant II - the Particularly Petty
Dread Empress Massacre The First
Dread Emperor Nihilis The First - The Tanner
Dread Emperor Nefarious The First
Dread Emperor Perfidious The First
Dread Emperor Pernicious The First - the Imperilled
Dread Empress Prudence The First - the Frequently Vanquished
Dread Emperor Reprobate The First
Dread Emperor Revenant The First
Dread Empress Sanguina I - the Gourmet
Dread Empress Sanguinara The First
Dread Empress Sinistra II - the Coy
Dread Empress Sinistra IV - the Erroneous
Dread Emperor Sinister The First
Dread Emperor Sorcorous The First
Dread Emperor Sulphourous The First - the Technicaly Correct
Dread Emperor Tenebrous The First
Dread Empress Terribilia The First
Dread Emperor Terribilis I - the Lawgiver - the Thorough
Dread Emperor Tratorious The First
Dread Emperess Triumphant - First And Only Of Her Name