In the mirror universe, Solkar was a male Vulcan who lived in the 21st century. He had a son named Skon. Solkar was the grandfather of Sarek, and the great-grandfather of Spock. (TOS movie: Star Trek III: The Search for Spock and TOS episode: "Mirror, Mirror")
In the mid 21st century, Solkar was the captain of the survey ship T'Plana-Hath. On April 5th, 2063 the T'Plana-Hath was passing through the Sol system when it discovered a human warp signature. Following procedure, Solkar had the T'Plana-Hath proceed to Earth to investigate the warp signature, and landed at the settlement in Bozeman, Montana from where the Phoenix had been launched. Solkar was the first to exit the T'Plana-Hath, and met the creator of the warp ship, Zefram Cochrane.
Solkar gave Cochrane the Vulcan salute. Cochrane responded by taking his rifle and shooting Solkar, killing him. Cochrane and the other people living in the settlement then stormed the Vulcan ship, and captured her. They used the technology contained within to move out into the interstellar community - establishing the Terran Empire as an interstellar power. (ENT episode: "In a Mirror, Darkly")
His great-grandson Spock would later rule as the last Terran Emperor from 2277 to 2293 and the first and only Consul of the Terran Republic from 2293 to 2295. (TOS - Mirror Universe novel: The Sorrows of Empire)