Imperial Timeline

The following contains the notable or important events in the Empire of Man. * Under Construction
 * -30 IC -- Sigmar is born to the chief of the Unberogen Tribe.
 * -15 IC -- Sigmar rescues Dwarf prisoners from the Orcs. Included among them is King Kurgan Ironbeard. Sigmar is given the magic hammer Ghal Maraz, or Skull Splitter, an ancient heirloom of the Dwarf King's family.
 * -8 IC -- Upon the death of his father, Sigmar becomes chief of the Unberogen tribe.
 * -1 IC -- The Battle of Black Fire Pass. An alliance of human tribes led by Sigmar and a Dwarf army under Kurgan Ironbear defeats a large Orc and Goblin army.
 * 1 IC -- Sigmar is crowned Emperor by the High Priest of Ulric.
 * 50 IC -- After a half century of building and prosperity in the newly proclaimed Empire, Sigmar vanishes into the east. The system of Elector Counts is established whereby the provincial leaders elect one of their number to be Emperor.
 * 73 IC -- The spreading Cult of Sigmar the Patron God of the Empire receives its first Grand Theogonist Johann Helstrum.

Source
Warhammer Armies: Empire (4th Edition)

pg. 11