Dear Phrygian! I am coming from Pavlenishvili family, who were decsendandts of one of Mkhargrzelis (13th century). In my family we have always kept the information that Mkhargrdzeli were a part of Karin-Pehlevi dynasty, one of the 7 great houses of Persia. Karin-Pehlevi family itself is a branch of an ancient dynasty of Parthian rulers - Arsacides. This genealogy is precisely described by Cyrille Toumanoff (Toumanishvili) in his "Le MAison Princieres Georgiennes...", (Rome 1983).