Three Sisters

The legend of "Les Trois Soeurs" is one often repeated in Orlais, but can even be heard in almost every other nation across Thedas. Every telling has its own variations, some small and others massive. Most would agree that these three are the most talented bards to ever walk the lands of Thedas. The Three Sisters have many books written about them.
It is unclear to the general public if they are still alive or not, though it is commonly assumed that they're still out doing antics somewhere.

Mental characteristics

Personal history

"In some [stories], the sisters are depicted as innocent on the surface, but eagerly engaging in bawdy exploits the moment they escape from their chaperone. In others, the sisters are heroic, valiantly solving any number of problems (sometimes unintentionally). Some tales instead claim them as clueless, bumbling from one adventure to the next and unwittingly leaving riots and chaos in their wake. The nature depends on who is telling the story or where they heard it last. Sometimes it's a raunchy tale for tavern drunks; other times, it's a scandalous tale told to criticize rulers or even the Chantry. There are common elements shared between all these stories.
Many people claim some sort of association of personality with one of the three Montbelliard sisters: Brielle, Marie, or Sheryse. Brielle is the innocent one; she's wide-eyed and often startled like a doe lost in the wilderness. Almost always, though, by the end of the tale she bursts out of her shell the most and the other characters like her the most. Marie is brash and suspicious of everything she sees. Her keen-eyes never let anything get past her and her sarcastic yet deceptive tongue always allowed her to pull a fast one on others (often her own sisters, to a greatly humorous effect). Sheryse is the adventurous one, intrigued by all the sights and sounds of the market and the most heedless of any dangers. For those curious: Brielle played the pan flute (which she later used to tame a lizard which became another of the sister's long-term companions), Marie played the violin, and Sheryse played the lute.
One such story, from when they were but young girls, details their escape from their chaperone and finding the White Rose (a well-known Orlesian brothel, for those out of the know). They entered due to Sheryse's interest with all the beautiful dresses the men and women wore. Quickly, Marie realized that the "friendlier gentlemen" were not what they seemed. Brielle is swung off her feet and caught amongst all the dancing patrons. This leads to a chase through the White Rose, Marie and Sheryse stumbling into room after room looking for Brielle while also meeting several of the patrons in more lewd acts (in some stories, they even met Empress Celene!). Marie quickly gives up and joins a dwarf in smoking an illicit substance from a wildly described contraption. It's at this point that Sheryse jumps on the stage and sings the Orlesian national anthem, getting the entire brothel to allow her to crowd-surf to both Brielle and Marie. Details vary, but in many tellings the White Rose ends in flames. Thankfully, many years later, they rebuilt the White Rose as their own.
Other people tell stories of when the women grew older and are drawn to Val Royeaux's annual Satinalia parade. There, they foil an assassination attempt on Empress Celene's life. The story sounds simple, but is far from it. It involves the sisters stowing away on a pirate ship, wading through the city elves's alienage sewers, convincing Antivan Crows that they were the organization's Talons (head-honchos), drinking forty glasses of ale between the three of them, and finding a golden halla.
To be quite honest, if you dream up any wild and fantastical story and pin the name of the Three Sisters to it, I'm sure it'll gain traction.

From Tales of Val Royeaux by Lord Werner Jauquin

Aligned Organization

Orlais