2013

==Real-world events==
===February===
*February 25: The Majestic map pack, the second Halo 4 downloadable content, was released.
===March===
*March 19: Halo: Silentium, the third and final novel in the Forerunner Saga by Greg Bear, was released.Tor Books updates release date of the third Halo novel by legendary science fiction author Greg Bear
===April===
*April 8: The Castle map pack, the third Halo 4 downloadable content, was released.
===May===
*May 21: Halo: The Television Series was announced at the Xbox One reveal event.
===June===
*June 10: The Halo Xbox One Announcement Trailer is shown at E3 2013.
===July===
*July 18: Halo: Spartan Assault was released for Windows 8 and Windows Phone.
===August===
*August 14: Issue 1 of Halo: Initiation was released.
*August 20: The Champions Bundle was released on the Xbox Live Marketplace.
===September===
*September: McFarlane Toys/Halo 4 Series 2 figures were released to stores.
*September 11: Issue 2 of Halo: Initiation was released.
*September 16: Halo 4: The Essential Visual Guide was released in the U.S.
===October===
*October 1: Halo 4: The Essential Visual Guide was released in Europe.
*October 9: Issue 3 of Halo: Initiation was released.
*October 29: 343 Industries announced that Halo: Spartan Assault would be coming to the Xbox 360 and Xbox One in December 2013.Halo Waypoint - Spartan Assault is coming to Xbox One and Xbox 360
===November===
*November 22: The Xbox One was released in thirteen selected markets.
===December===
*December 11: Issue 1 of Halo: Escalation was released.
*December 23 - Halo: Spartan Assault was released for Xbox One.
==Sources==