Salah Bey

Salah Bey was the captain of Nāder Shāh's guards, and an ally of Achilles Davenport, the Mentor of the Colonial Brotherhood of Assassins.

In 1747, Salah and his men attacked Nāder Shāh. Although the Shāh was able to kill two of Salah's men, the latter was able to assassinate him with a sword. However, the Koh-i-Noor in the Shāh's possession was discovered to have ended up in the hands of Ahmad Shāh Durrānī, an Afghan chief. Salah thus planned to pursue him in order to acquire the Piece of Eden.

Following the assassination of Nāder Shāh, Salah wrote a letter to Achilles, detailing the events. Although he expressed that he was glad to have allies in the Brotherhood, Salah also mentioned that he regretted not having the time to be better acquainted with Achilles and his cause.

Reference

 * Assassin's Creed: Rogue