Alternate timeline
(covers information from an alternate timeline)
M'Talas was a prominent Lihn Zhee chieftain who lived during the 24th century.
At some point before 2401, M'Talas was killed by General Jean-Luc Picard, and his skull was later mounted on display in his trophy room at Château Picard. (PIC: "Penance")
This individual was only mentioned in writing.
M'Talas was presumably named for Terry Matalas, showrunner and executive producer of seasons two and three of Star Trek: Picard.