The investigators found many references to the name Hastur as they learnt more of the plots of Malcolm Quarrie, Lawrence Bacon and Montague Edwards:

• In Talbot Estus' play Carcosa, or The Queen and the Stranger Hastur is the name of the land in which the Lake of Hali and the city of Yhtill are situated. Strictly speaking it is 'the land of Hastur' which could, of course mean that it is 'Hastur's land', rather than Hastur being the name of the land itself.
• Every mention of 'Hastur' in the work of Robert W Chambers is ambiguous and could equally refer to a land or an entity.
• In Ambrose Bierce's 'Haita the Shepherd', Hastur is the name of an apparently benign pagan God.
• When the investigators visited Carcosa, they were informed by Alexander Roby that Hastur is yet another name for The King in Yellow and that he is served by the Byakhee.