Tri-Skull of Saint Uther
From Warhammer 40k - Lexicanum
The Tri-Skull of Saint Uther is a holy relic of the Calixian Ministorum. A genuine miracle, it is a set of three skulls all belonging to the head of Saint Uther the Cataplast[1]
The first skull comes from the saint at age twelve, the second one, at age fifty, shows markings suffered by Uther on behalf of an Ogryn who was protecting Lord Commissar Erranet, and the third one is pitted with shrapnel from the ninety-ninth wound that finally felled the saint at age one hundred and fifty.[1]