What is "hulwan"

Hulwan was an ancient town on the Zagros Mountains in western Iran, located on the entrance of the Paytak Pass, nowadays identified with the village of Sarpol-e Zahab.

Hulwan (Syriac: ), one of the chief towns in the western Iranian province of Media, was a metropolitan province of the Church of the East between the eighth and twelfth centuries, with suffragan dioceses for Dinawar, Hamadan, Nihawand and al-Kuj (perhaps Karaj d'Abu Dulaf). Hulwan was ranked among the 'exterior provinces', so called to distinguish them from the province of the patriarch and the five core Mesopotamian 'interior' provinces.