In light of Rise of Iron... uh... Lord Saladin.
Rise of Iron reveal:

A hero to the City and a legend in his own right, Saladin Forge led the
City's defense during the Battle for the Twilight Gap. His protégés,
Commander Zavala and Lord Shaxx, now lead the Tower's Vanguard and the
Crucible, respectively. Saladin remains close to Zavala, though his
relationship with Shaxx has been strained since the Twilight Gap.


The Iron Banner seeks great champions to lead the fight against the
Darkness. It was born to honor the Iron Lords and their efforts in the
earliest days of the City.

source:http://db.destinytracker.com/grimoire/allies/tower-allies/iron-banner-rep