The Imperial Sardukar was created by the Emperor.
It is commanded by Ser Barristan the Bold.
It is a Imperial Household Military Unit.
The Imperial Sardukar consists of specially trained shock troops and knights who have embraced a code that allows them to deal with a greater variety of situations and opponents. In addition to its Hoplite style infantry sections, it includes a Heavy Cavalry century that rides with the Emperor in war or diplomacy, or for functions of state.
Official Charter - raw