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Villains Wiki
Villains Wiki
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You call me that again and I'll throw you in the ocean!
~ Liam O'Brien to Shay Cormac.
I don't miss!
~ Liam to Shay during their final encounter.

Liam O'Brien (1726-1760) is the secondary antagonist of Assassin's Creed: Rogue. He was an Irish member of the Colonial Assassins, and long time best friend turned rival of Shay Cormac after the latter's betrayal.

He was voiced by Julian Casey, who also voiced William Johnson in Assassin's Creed III.


Early Life

Liam was born in Plymouth, Massachusetts in 1726 to a family of Irish immigrants. The O'Briens struggled on their farm and later moved to New York. Liam joined his father in working for a shipping merchant loading England-bound ships. It was in this business where he met Shay Cormac. Immediately the two became best friends, with Liam often looking after Shay, due to his rough living conditions.

After a few years, Liam's employees were growing in wealth, while their employees were unpaid and mistreated by the authorities. These tensions grew to a breaking point, and Liam recruited several co-workers in a plot to rob their employer and distribute the money among each other. They got caught in the middle of the heist and Liam killed a man in self-defense. To protect Liam, his father took the blame and was executed.

Joining the Assassin Brotherhood

After his father's execution, Liam moved from one job to another and committed theft to help his aging mother. Liam began drifting away from his friends, including Shay. In 1738, he met master assassin Achilles Davenport who tasked him with small errands. Over time, Liam looked to Achilles as a mentor and became influenced by the Assassin order. Achilles eventually inducted Liam as a member, thus making Liam his first student. Liam helped Achilles recruit other members of the brotherhood such as Hope Jensen, Kesegowaase, and Louis-Joseph Gaultier, Chevalier de la Vérendrye.

Liam breaking Shay and Chevalier up while they were fighting.

22 years later in 1748, Shay lost his father and reconnected with Liam, who helped him get back on his feet and recruited him to the Brotherhood. Because of his bond with Shay, Liam was tasked by Achilles to look after Shay, just like he did when they were children.

Assassin Expedition and Liam's death

12 years later in 1760, the assassins found the Voynich Manuscript and Precursor Box, which they thought might lead to a piece of Eden. When Shay was sent to Lisbon to find the artifact, ithe accidentally caused an earthquake that destroyed the city, causing him to betray the Assassins and join their enemys, the Templars. When Liam and Achilles traveled to the Arctic to find a simialr artifact, they were confronted by Shay and Haytham Kenway. Liam attempted to shoot Shay, but was stopped by Achilles, and knocked over the artifact. This caused the area to destabilize like it had in Lisbon and the temple began to collapse around them.

The Assassins meeting in New York.

Liam took the manuscript and fled the Temple, but was followed by Shay. Liam revealed to Shay that Chevalier had taken the Precursor Box and hidden it where the Templars would never find it. Shay cornered Liam on a cliff, and the two fought. A tremor from the earthquake caused the cliff side to collapse and both men fell. Shay suffered minor wounds, but Liam's were fatal. He questioned why Shay joined the Templars to which Shay replied "to save the World." Liam sarcastically hoped that it would be a good one before dying. In respect for his old friend, Shay pulled Liam's hood over him.


Liam is a patient and respectful person who does not hesitate to intervene between Shay and Chevalier fighting. He is seen as a more peaceful and calm character, but would not hesitate to sacrifice his friendship for the sake of fulfilling the duties of the Brotherhood. He also believed in the Creed and admired fellow Assassin mentor, Adewale.

Skills and Abilities

He is a very skilled assassin and a proficient marksman and swordsman. He was also capable of defeating a number of colonial soldiers, and had some knowledge of sailing, acting as the first quartermaster of Shay's ship, the Morrigan. Liam is also a skilled freeruner, being able to perform a leap of faith. He is a skilled man in the field of weapons, equipped with two hidden blades, a sword, and, his preference, dual pistols.



  • Concept art shows him wielding an axe, but he never uses one in-game.
  • He is obviously not meant to be confused with the real life voice actor of the same name.


           Assassins creed logo.png Villains


Juno | Instruments of the First Will | Builder | Loki

Templar Order

Cult of Kosmos (Peloponnesian War)

Aspasia | Deimos | Kleon | Pausanias of Sparta | Exekias | Iokaste | The Hydra | Polemon | Nyx | Elpenor | Sotera | The Master | Hermippos | Midas | Epiktetos | The Centaur of Euboea | The Chimera | The Silver Griffin | Machaon | Brison | Podarkes | Rhexenor | Iobates | Kodros | Pallas | Deianeira | Belos | Swordfish | Okytos | Melite | Harpalos | Zoisme | Diona | Chrysis | The Mytilenian Shark | Melanthos | The Octopus | Sokos | Asterion | Skylax | The Monger | Lagos | Kallias | Silanos

Order of the Ancients

Achaemenid Empire / Greek City-States: Amorges | Gergis | The Immortals | Artazostre | Dimokrates | Gaspar | Harpagos | Pithias | Phila | Augos | Megakreon | Nestor | Sophos | Nestor | Pactyas | Nestor | Akantha | Bubares | Echion | Konon | Phratagounè | Timosa
Ptolemaic Dynasty: Flavius Metellus | Lucius Septimius | Julius Caesar | Pothinus | Berenike | Hetepi | Khaliset | Taharqa | Eudoros | Medunamun | Rudjek | Ktesos | Actaeon | Gaius Julius Rufio | Ampelius | Ptahmose | Tacito
Tang Dynasty: An Lushan | Bian Lingcheng | Gao Lishi | Li Linfu | Li Zhuer | Shi Siming | Yan Zhuang | Yang Guozhong | Wang Chengye | Gao Miao | He Qiannian | Li Qincou | Sun Xiaozhe
Viking Age: Alfred the Great | Fulke | Gorm Kjotvesson | Avgos Spearhand | Frideswid | Hunta | Kjotve the Cruel | Leofgifu | Vicelin | Tatfrid | Gifle | Havelok | Herefrith | Mucel | Patrick | Wigmund | Reeve Derby | Abbess Ingeborg | Audun | Eanbhert | Grigorii | Gunilla | Tata | Blaeswith | Beneseck of Bath | Ealhferth | Heika of Friesland | Hilda | Selwyn | Yohanes Loukas | Zealots (Beorhtsige | Bercthun | Callin | Cola | Cudberct | Eorforwine | Heike | Horsa | Hrothgar | Kendall | Osgar | Redwalda | Wealdmaer | Woden)| Eogan mac Cartaigh | Bécc mac Nath-í | Niamh | Ruaidrí | Aideen | Conlae | Sétnae | Cummascach | Leasleach | Trian

Knight Templars (Crusades)

Robert de Sable | Maria Thorpe | Tamir | Talal | Garnier de Naplouse | Abu'l Nuqoud | William of Montferrat | Majd Addin | Jubair al Hakim | Sibrand | Haras | Armand Bouchart | Jacques de Molay

Italian Templars (Italian Renaissance)

Rodrigo Borgia | Ludovico Orsi | Checco Orsi | Jacopo de' Pazzi | Uberto Alberti | Francesco de' Pazzi | Vieri de' Pazzi | Antonio Maffei | Stefano da Bagnone | Bernardo Baroncelli | Francesco Salviati | Emilio Barbarigo | Marco Barbarigo | Carlo Grimaldi | Silvio Barbarigo | Juan Borgia the Elder | Lucrezia Borgia | Cesare Borgia | Octavian de Valois | Micheletto Corella | Silvestro Sabbatini | Malfatto | Ristoro | Lia de Russo | Auguste Oberlin | Fiora Cavazza | Il Carnefice

Spanish Templars (Spanish Inquisition)

Tomás de Torquemada | Ojeda | Ramirez

Byzantine Templars (16th Century Ottoman Empire)

Prince Ahmet | Manuel Palaiologos | Shahkulu | Leandros | Cyril of Rhodes | Damat Ali Pasha | Georgios Kostas | Lysistrata | Mirela Djuric | Odai Dunqas | Vali cel Tradat

Chinese Templars (Ming Dynasty)

Zhang Yong | Qiu Ju | Wei Bin | Yu Dayong | Ma Yongcheng | Gao Feng

Caribbean Templars (Golden Age of Piracy)

Laureano de Torres y Ayala | Woodes Rogers | Benjamin Hornigold | Josiah Burgess | John Cockram | Julien du Casse | Kenneth Abraham | Jing Lang | Hilary Flint | Lucia Márquez

Louisiana Templars (18th Century New Orleans)

Madeleine de L'Isle | Rafael Joaquín de Ferrer | George Davidson | Diego Vázquez | Antonio de Ulloa

Colonial Templars (American Revolution)

Haytham Kenway | Charles Lee | Nicholas Biddle | Benjamin Church | Shay Cormac | Thomas Hickey | John Pitcairn | William Johnson | Jack Weeks | Christopher Gist | George Monro | Edmund Judge

British Templars

Georgian and Colonial Era: Reginald Birch | Edward Braddock | Lawrence Washington | Samuel Smith | James Wardrop
Victorian Era: Crawford Starrick | Lucy Thorne | James Brudenell, 7th Earl of Cardigan | Philip Twopenny | Pearl Attaway | Malcolm Millner | John Elliotson | David Brewster | Rupert Ferris | Brinley Ellsworth | William Sleeman | Alexander Burnes

Parisian Templars (French Revolution)

Radical faction: Francois-Thomas Germain | Charles Gabriel Sivert | Le Roi des Thunes | Frédéric Rouille | Marie Lévesque | Louis-Michel le Peletier | Aloys la Touche | Flavigny | Marcourt | Maximilien de Robespierre | Jean Gilbert | Denis Molinier | Duchesneau | Arpinon
Moderate faction: François de la Serre | Élise de la Serre | Chrétien Lafrenière | Comte de Choisy

Russian Templars (Russian Revolution)

Yakov Yurovsky

21st Century Templars (Abstergo Industries, mainly)

Alan Rikkin | Warren Vidic | Daniel Cross | Juhani Otso Berg | Laetitia England | Laetitia England | Álvaro Gramática | Isabelle Ardant | Violet da Costa | Melanie Lemay

Templar's Allies and Puppets
Xerxes I of Persia | Ptolemy XIII | Cleopatra | Al Mualim | Abbas Sofian | Richard I of England | Sixtus IV | Dante Moro | Paganino | Jiajing Emperor | Isabella I of Castile | Duncan Walpole | Laurens Prins | Vance Travers | El Tiburón | Jean-Jacques Blaise d'Abbadie | James Cook | Kanen'tó:kon | Jacques Roux | Maxwell Roth | Leon Trotsky

Assassin Brotherhood & Their Allies
Achilles Davenport | Hope Jensen | Adéwalé | Kesegowaase | Liam O'Brien | Louis-Joseph Gaultier, Chevalier de la Vérendrye | Le Chasseur | Basim Ibn Ishaq

Bellatores Dei
Ebels | Engelwin | Euphrasia | Gozllin

Girolamo Savonarola's forces
Girolamo Savonarola | Painter | Guard Captain | Nobleman | Priest | Merchant | Doctor | Farmer | Condottiero | Preacher

Tyranny of George Washington
George Washington | Isreal Putnam | Benedict Arnold

Jack the Ripper
Jack the Ripper | John Billingsworth | Olwyn Owers

Gamilat | Isidora | Burgred of Mercia | Rued | Eadwyn | Ivarr the Boneless | Ricsige of Northumbria | Modron | Charles the Fat | Ercole Massimo | Peter Chamberlaine | Bartholomew Roberts | Pierre, Marquis de Fayet | Silas Thatcher | Philippe Rose | Fiend of Fleet Street