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|Segmentum=[[UltimaSegmentum]]

|Subsector=Unknown[[Ultramar]]

It is a planet of stormy seas and islands of rock. It has a single continent named '''GlaudorTalassar'''is an [[Imperial]] [[ocean world]], which was located in the site of a major battle between the Ultramarines and [[OrkUltramar|Realm of Ultramar]] invaders just after in the [[Horus HeresyUltima Segmentum]].{{Fn|3a1}} {{Fn|2}} ==History==During the [[Shadow Crusade]], the planet was assaulted by the [[Word Bearers]].{{Fn|4}}  Later, the great horde of [[Orks]] descended on the single main continent of Talassar, [[Glaudor]] of Talassar, threatening to destroy cities there. Following the protocols of the newly approved [[Codex Astartes]] , the [[Ultramarines]] made a series of rapid strikes and defeated the greenskins.{{Fn|6}}

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]] 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 by the arrival of the 2nd and 4th Companies of the Ultramarines, led by Captains [[Cato Sicarius]] and [[Uriel Ventris]], respectively. Uriel Ventris pronounced the mortal name of the Daemon Prince, and gave the [[Shard of Erebus]] to Calgar, who used it to stab M'kar in the throat. As a result, M'kar was destroyed once and for all.{{Fn|3c}}

==Geography==Talassar 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}}{{Fn|6}} === Notable Places ===*[[Castra Tanagra]]: - an ancient fortress located in a valley on Glaudor, the site of 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}}*'''Glaudor''' — single continent of the planet.{{Fn|6}}

*{{Endn|1}}: [[Codex: Ultramarines]], by Rick Priestley, pg. 14

*3: [[The Chapter's Due (Novel)]] by [[Graham McNeill]]

*{{Endn|4}}: [[The Purge (Novella)]] , Chapter 1*{{Endn|5}}: [[White Dwarf October 2017]], pg. 118 — '''Heavy Metal''*{{Endn|6}}: [[Codex: Space Marines (8th Edition)]], pg. 28, - ''Chronicles of Ultramar - The Green Hordes of Talassar''