The Biotechnical Division was a scientific research group of the early Imperium of Man that was formed on Terra before or during the ancient Unification Wars of the late 29th and 30th Millennia by the Emperor of Mankind.

Many of its laboratories were located deep beneath what later became the Imperial Palace complex in the Himalazian (Himalayan) Mountains.

The skilled scientists and engineers of the Biotechnical Division were tasked by the Emperor with carrying out both the Primarch Project and the creation of the Space Marine Legions.

The first director of the Biotechnical Division was the famed Terran geneticist Amar Astarte, who gave her name in High Gothic to the Legiones Astartes.

By the time of the Horus Heresy in the early 31st Millennium, Astarte had been replaced as director by the even more skilled Terran scientist Ezekiel Sedayne. A portion of Sedayne's personality would later be incorporated into that of Archmagos Dominus Belisarius Cawl and would help to provide the archmagos with his unparalleled skill at genetic engineering.


  • Belisarius Cawl: The Great Work (Novel) by Guy Haley, Ch. 19
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