The Emperor's Architect is a short story published in The Primarchs series that was originally part of an anthology. The Emperor's Architect was first published as part of the Sons of the Emperor anthology in February 2018. The cover image used is that of Sons of the Emperor, as The Emperor's Architect has yet to be published separately.
A pair of Remembrancers tasked with chronicling the lives and histories of the Primarchs journey to Olympia and meet with the formidable Perturabo. They are ill-prepared for what they find, however, as they discover the truth about the Lord of Iron and his intimidating legend.
- Sons of the Emperor (Anthology), "The Emperor's Architect" (Short Story) by Guy Haley