The Order of the Argent Shroud is one of the Orders Militant of the Adepta Sororitas, or the Sisters of Battle, founded in honour of Saint Silvana by the Ecclesiarch Alexis XXII (the long-lived successor of the great reformer, Sebastian Thor) in the 36th Millennium when the Convent Sanctorum was split between the Convents on Ophelia VII and Terra, founding the Orders Militant of the Ebon Chalice, Valorous Heart, Fiery Heart and the Argent Shroud.