Omurtag also known as Murtag or Murtagon was a Great Khan of Bulgaria from 814 to 831. He is known as "the Builder".
In the very beginning of his reign he signed a 30-year peace treaty with the neighboring Byzantine Empire which remained in force... Wikipedia
Died: 831 AD
Children: Malamir of Bulgaria, Enravota, and Zvinitsa
Great grandchildren: Boris I of Bulgaria, Doks of Bulgaria, and Anna
Great-grandparent: Kermek (?)
Full name: Omurtag
Parents: Krum
Grandchild: Presian of Bulgaria