Zanjan province is said to be one of the regions of Iran, rich in historical background. That is remnants from the pre-historic period (7th millennium BC. till early 3rd millennium BC.), are evident here. Moreover, in the (2nd and 3rd millennium BC.) in the Ijrud (Zanjan) region distinctive elements portraying a thriving and progressive civilization in this central plateau of Iran has come to light. The evaluation of the black colored engravings on the buff or cream colored earthenware, brings to focus a link and continuity between the civilizations of the Damqan Hessar Hill, Sialk Hill (Kashan) and the Ijrud (Zanjan) civilizations.
In most prominent and spectacular historical vestiges of this period is a kind of gray black earthenware which complies to the period of Aryan migration to this region. This type of earthenware discovered can be said to be similar to a teapot with a long spout, found in all the tombs of that age and can be related to the funeral ceremonies.
In accordance with Assyrian documents, this region was called Andya in the 9th century BC. and the inhabitants were probably in communication with the Lulubi and Gouti tribes residing on the slopes of the Zagross Mountain Range. Coins such as Derik and Riton discovered in Khoda Bandeh are the remnants of the Achaemenian era. During the Parthians and Sassanian periods, the valleys of Zanjan Road and Qezel Ozan proved to be flourishing and thriving areas of the region. Here the most important historical remnant that can be pointed out is the Tashvir Fire Temple.
But advancing towards the Islamic period that is from the (7th to 19th century AD.) equivalent to the (1st century to 14th century AH.); brought about the Osman conquests in Iran. Existing texts and evidences reveal that during the Islamic period throughout ,i.e., during the reigns of the various dynasties such as, the Karganian, Saljuqian and Ilkhanan, specially from the (4th to 8th century AH.) this region thrived from economic, cultural and artistic point of view. One of the reasons that Soltanieh was chosen as the capital was due to the fact that this region was at its economic peak in the (7th and 8th centuries AH.). This territory was disheveled and ruined during the Mongol attack, but regained its importance during the reign of Soltan Mohammad Khoda Bandeh and become a renounced capital for the Ilkhan government.
In accordance to the orders of Oligaito, a rampart was built around Soltanieh in the midst of which a huge fort was created. Oljaito also constructed a large dome which was to house his tomb and this dome is the renounced 'Gonbad ' or dome of Khoda Bandeh. During the reign of Oljaito, Soltanieh was counted as one of the most important cities of the Ilkhanans after the city of Tabriz.
In the 9th century AH. after the decline of Ilkhanans, the Sarbedarans came to power. But during the attack of Teimoor the Lame, the Zanjan region fell to ruins and it was only during the reigns of Shah Tahmasb Safavid and earlier in the reign of Mohammad Khan Qajar that this territory made relative advancement both culturally and economically.