The term ONE-TIME CAPITAL OF IRAN is answered by the crossword solution TABRIZ, which is a city in northwestern Iran. Tabriz was the capital of Iran for several centuries and served as the country's most important city during the Safavid dynasty from 1501 to 1736. It was also the capital of the short-lived Azerbaijan Democratic Republic in 1918. Today, Tabriz is an important commercial and industrial center in Iran.