The Paenitentiale Theodori (also known as the Iudicia Theodori or Canones Theodori) is an early medieval penitential handbook based on the judgements of Archbishop Theodore of Canterbury. It exists in multiple versions, the fullest and historically most important of which is the U or Discipulus Umbrensium version (hereafter the Paenitentiale Umbrense), composed (probably) in Northumbria within approximately a decade or two after Theodore's death. Other early though far less popular versions are those known today as the Capitula Dacheriana, the Canones Gregorii, the Canones Basilienses, and the Canones Cottoniani, all of which were compiled before the Paenitentiale Umbrense probably in either Ireland and/or England during or shortly after Theodore's lifetime.