Vakhtang VI of Kartli
He was the son of Prince Nikoloz Gruzinsky and a scion of the Mukhrani-Gruzinsky branch of the Bagrationi dynasty that had moved to Imperial Russia in the 18th century. Pyotr Nikolayevich Gruzinsky was the last direct male descendant of King Vakhtang VI of Kartli and the last in the Gruzinsky line.