- Davos: "Westeros is not the world, your grace. We need to look east for ships and men. Ten thousand skilled soldiers fight for the Golden Company."
- Stannis: "The Golden Company?!"
- Davos: "They've never broken a contract."
- Stannis: "They're sellswords!"
- Davos: "We're willing to use blood magic to put you on the throne, but we're not willing to pay men to fight?!"
- — Davos Seaworth and Stannis Baratheon[src]
The Golden Company is a sellsword company active in Essos. They are one of the largest and most skilled sellsword companies in the Free Cities, consisting of 10,000 well-trained soldiers at the time of the War of the Five Kings. They have the reputation of never breaking a contract, which is quite uncommon among mercenary organizations.
Davos Seaworth suggests to Stannis Baratheon that he hire the Golden Company to help him win the Iron Throne. Stannis refuses, believing sellswords to be unfit to join his army. Davos finds it hypocritical that Stannis would use blood magic to with the throne but not pay men to fight.
When Jorah Mormont advises Daenerys Targaryen not to trust Daario Naharis because he is a sellsword, she points out that he himself fought for the Golden Company before pledging his sword to her brother Viserys.
In the books
In the A Song of Ice and Fire novels, the Golden Company was founded one hundred years before the War of the Five Kings by Aegor Rivers, aka "Bittersteel", one of the bastard sons of King Aegon IV Targaryen, after he fled Westeros following the Blackfyre Rebellion. When Aegor, who for a time served with the Second Sons, saw all the exiled lords and knights signing on with other sellsword companies, and saw the support of House Blackfyre ebbing away, he created his own sellsword company. That way, the Blackfyres could at least maintain some sort of core fighting force in between their repeated attempts to overthrow the Targaryens, gaining experience from fighting in the petty wars of the Free Cities, as well as gaining enough money from their contracts to keep functioning.
Their motto is "Our word is as good as gold", while their battle cry is "Beneath the gold, the bitter steel!" - in reference to their founder, Bittersteel.
The company is composed mostly of Westerosi exiles, and sons of exiles. Many of the core members are descended from the hundreds of Blackfyre supporters who fled across the Narrow Sea at the end of the First Blackfyre rebellion. Over the past century their ranks were joined by other men who ended up on the losing side of rebellions in Westeros, who fled to the Free Cities to nurse dreams of reconquest rather than face execution or exile to the Night's Watch.
The Golden Company's reputation was quickly established when, soon after the company's founding, Qohor refused to honor the contract it had made. The sellswords of the Golden Company sacked Qohor as an answer to Qohor's refusal.
The Golden Company did not take part in the "Second Blackfyre Rebellion", which was really more of a short lived plot than a battle (much less a war), but it did take part in the Fourth Blackfyre Rebellion, an invasion which landed in Massey's Hook (the southern Crownlands, near the northern Stormlands) but which was not very successful. During the last Blackfyre rebellion, known as the War of the Ninepenny Kings, the Golden Company formed one of the core parts of the Blackfyres' forces in the Stepstones, but they were defeated by the young Brynden Tully and Barristan Selmy.
At the time of the War of the Five Kings, the Golden Company is the largest and best disciplined sellsword company in the Free Cities, functioning as an elite private army. Their forces consist of 10,000 men: 1,000 cavalry, 1,000 archers, and 8,000 infantry, as well as a number of war elephants.
In the novels there is no mention of Jorah Mormont having been a member of the Golden Company.