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Soltaniyeh was a capital city in Iran, established in the early 14th century by the Il-Khanid ruler Öljaitu. It was a significant center of Il-Khanid architecture, with Öljaitu's mausoleum being a prime example. The city was located near Kazvin. While Öljaitu's reign saw the proclamation of the Shīʿite branch of Islam as the state religion of Iran, Soltaniyeh itself is primarily noted for its architectural achievements and its role as a former capital. It is now a UNESCO World Heritage site.123

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