Serron was a Vulcan who lived in the 23rd century
In 2258, he commanded a Vulcan scientific vessel to the 40 Eridani A system where Vulcan once stood.
Serron discovered red matter just as his ship was attacked by Vulcans posing as Romulans. He was rescued by the crew of the USS Enterprise.
Serron explained everything to Spock. (TOS comic: "Vulcan's Vengeance, Part 1")