Brethren White Were the followers of a priest from the Alps about the beginning of the fifteenth century. They and their leader were arrayed in white garments. Their leader carried about a cross like a standard. His apparent sanctity and devotion drew together a number of followers. This deluded enthusiast practiced many acts of mortification and penance, and endeavoured to persuade the Europeans to renew the holy war. Boniface IX. ordered him to be apprehended, and committed to the flames; upon which his followers dispersed.