Mat'trub
Mat'trub was a Human who lived in the 32nd century. He was an Emerald Chain holdout, one of those who aspired to succeed Osyraa after her death in 3189.
In 3190, Mat'trub visited Haz Mazaro's Karma Barge to obtain isolynium, for which he played Leonian poker against Zakari, Michael Burnham, and Cleveland Booker. Burnham and Booker cooperated in a hustle to deny the isolynium to Mat'trub and Zakari, causing them to storm out. (DIS: "All In")
Mat'trub was played by Jason Gosbee. His name was not spoken onscreen, but was given in the end credits.