Final answer:
Most of Iran in the 1300s was under the Il-Khanate, a Mongol Khanate whose rulers embraced Islam and actively encouraged cultural and economic development within the region.
Step-by-step explanation:
In the 1300s, most of Iran was part of the Mongol Khanate known as the Il-Khanate. The Il-Khanate was governed by Mongol rulers who eventually converted to Islam, adapting to the local cultures and customs. Ghazan Khan's rule marked a significant shift as he converted to Islam in 1295, and Islamic culture began to thrive under Mongol patronage.
His brother Oljaitu promoted Shia Islam, which became more entrenched in the region, influencing today's eastern Iraq and Iran. During this period, the Il-Khanate rulers played an active role in fostering economic and cultural development, including the construction of schools, mosques, and bazaars, and promoting the arts and scholarship.