Cahin

"I am dealing with fools! Two of them. Cahin and Caha. French. Brother and sister. Ridiculous costumes."

- Fiora Cavazza describing the siblings.

Cahin (unknown - 1503) was a Templar and a corrupt French nobleman, who dressed in the costume of a harlequin clown. He was the brother of Caha, the Hellequin, and an individual hired by Cesare Borgia.

His genetic memories were later used by the Templar-owned company Abstergo Industries, for the training of their Animus recruits, under the title of the Harlequin.

Performance
"Cahin laughs his way through the door. Caha tips over a candelabrum before tumbling out behind him. I remain convinced that they are totally mad... yet fun!"

- Fiora Cavazza.

Around 1497, Cahin and Caha performed together, so as to lure an assigned target - a foreigner with some claim to royal blood - into the open. As Caha distracted their audience by juggling her daggers, Cahin slipped away and stabbed the man through his chair.

In the chaos that followed, Cahin, Caha, and their ally, Fiora Cavazza, finished off the rest of the guests.

Death
"He is agile enough to keep up with them for a while, even cutting one man's face, but he soon collapses with four swords running through his gut!"

- Fiora observing Cahin's final moments

In 1503, Fiora was betrayed by Cesare Borgia, and defected to his enemies, the Assassins, for her revenge. That year, she lead a team of them to pursue Cahin and Caha, who were performing on the streets of Rome.

As Caha realized their presence, she threw a smoke bomb into the crowd. As the audience scattered, Cahin attempted to escape, but was cornered by several of the Assassins. He drew a slender dagger to defend himself, agilely dodging his enemies' rapiers, but in time, was killed by four of them.

Enraged by her brother's death, Caha attempted to avenge him by attacking Fiora alone. However, she finally yielded, and made her way over to Cahin's body, where she sat cradling him and sobbing. Unbeknownst to her, she was approached from behind by an Assassin, who killed her by shooting a single crossbow bolt into her head.

Trivia

 * Cahin's and Caha's names are based on the French phrase "cahin caha," meaning "willy nilly."
 * In Brotherhood, five Harlequins can be found in five permanent locations near the waterfronts. For the player to receive the "Clowning Around" achievement, Ezio must beat up all five. If the player stands near them for long enough they will attack and under the use of Eagle Vision will glow gold.

Source

 * Assassin's Creed: Project Legacy - Chapter 1 - Fiora Cavazza