Jean-Luc Picard is a 24th century Starfleet officer, best known for serving as commanding officer of the U.S.S. Enterprise-D and U.S.S. Enterprise-E.
The presence of Picard in Star Trek Timelines was first revealed in the Starship Combat in Timelines dev blog.
Locutus's character page is redirected here, because he is a version of Picard.