Who is Hoopoe from The Source; a Novel and what is their importance?

Hoopoe is the engineer who built the wall around Makor. He is married to Kerith and is thirty nine years old. He has two children by Kerith and others by slave girls. He was given the job at Makor in return for his faithful service to King David. He is a descendant of Uriel and lives four hundred fifty years after him.