Sigmar was aided several times throughout his life by a dwarf named Alaric after he rescued the Dwarven King Kurgan Ironbeard, it was Kurgan who gave him Ghal-maraz(Skull-Splitter.) Due to his habit of aiding humans, other Dwarves dubbed him 'Alaric the Mad'.
Sigmar received assistance from Alaric, a dwarf who rescued the Dwarven King Kurgan Ironbeard. This led to Sigmar receiving Ghal-maraz (Skull-Splitter) from Kurgan and being nicknamed 'Alaric the Mad' due to his habit of helping humans.