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It is a planet of stormy seas and islands of rock. It has a single continent named '''Glaudor''', which was the site of a major battle between the Ultramarines and [[Ork]] invaders just after the [[Horus Heresy]].{{Fn|3a}} During the [[Shadow Crusade]], the planet was assaulted by the [[Word Bearers]].{{Fn|4}}

The Ultramarines' Second Company [[Space Marine Captain|Captain]], [[Cato Sicarius]], [[Master of the Watch]], was born to Talassari nobility, and was trained in the arts of war from a young age. His [[power sword]], the [[Talassarian Tempest Blade]], takes its name from his homeworld's frequent storms. Captain Sicarius is also, among his many honorific titles, Grand Duke of Talassar.{{Fn|1}}

In 854999.[[M41]], the [[Daemon Prince]] [[M'kar]] personally led the onslaught against Talassar. [[Marneus Calgar]] bring brought the 1st Company of the [[Ultramarines]] to Talassar, determined to once again slay M'kar. After the great battle Calgar was nearly defeated by M'kar, but was saved when arrived the 2nd and 4th Companies of the Ultramarines, led by Captains [[Sicarius]] and [[Ventris]]. Uriel Ventris pronounced the mortal name of the Daemon Prince, and gave the [[Shard of Erebus]] to Calgar, who stabbed used it to stab M'kar in the throat. As a result , M'kar's was destroyed once and for all.{{Fn|3c}}

*[[Castra Tanagra]]: an ancient fortress in a valley on Glaudor, the site of the an ancient battle between the Orks and the Ultramarines. During the battle, an enormous hole was breached in the walls, but [[Roboute Guilliman]] refused to have it repaired, decreeing that the fortress would stand in its battered condition as a monument to those who died during the battle. All [[Neophyte]] Ultramarines are required to make a pilgrimage to the fortress after their induction into the Ultramarines.{{Fn|3b}}