The Emperor Protects!
House Logos is one of the oldest and most respected houses in the Calixis Sector in the Imperium.
Their homeworld is Fenrith, near the edge of the Ixaniad Sector, where they have ruled for longer the recorded history; they have spread their power and wealth far and wide, though, and have tendrils in many other planets around both sectors.
They are currently expanding into many different areas, most recently Iocanthus and Scintilla.
The house built its fortune building the engines and drives of the space ships that ply the galaxy; it is rumoured that fully 70% of all ships in Battlefleet Calixis are powered by engines and machines built by house Logos. Since those early days, it has spread its arms to encompass many other areas, including a large and varied pharmaceutical interests, tools and machines used by all sectors of the economy ranging from agricultural through to ship-building and major construction. For the last few thousand years, it has been expanding greatly into military products, using its expertise to build advanced weapons such as melta and plasma weapons; it maintains close ties to many of the imperial military orders to better serve the emperor.