Introduction:
The correct answer is option 'B', Genghis Khan. Genghis Khan, the founder and first Great Khan of the Mongol Empire, believed that he had a mandate from God to rule the world. This belief was deeply ingrained in the Mongol culture and played a significant role in their conquests and expansion.

Genghis Khan's Rise to Power:
Genghis Khan, originally named Temujin, was born in the 12th century in Mongolia. He united the Mongol tribes through a series of military campaigns and became the leader of the Mongol Empire in 1206. Genghis Khan's rise to power was accompanied by a strong belief in his divine mission to conquer and rule the world.

The Mandate from God:
According to Mongol tradition, Genghis Khan was believed to be the embodiment of the Sky-God Tengri, who granted him the divine right to rule. This belief was reinforced by the shamans and religious leaders of the Mongols, who proclaimed Genghis Khan as the chosen one with a sacred mission.

The Role of Religion:
Religion, particularly shamanism and Tengrism, played a crucial role in Mongol society. The Mongols believed in a supreme deity, Tengri, who controlled the destiny of the world. Genghis Khan used religion as a tool to legitimize his rule and justify his conquests. He presented himself as the representative of Tengri on Earth and invoked divine authority to command his armies.

Religious Practices and Rituals:
Genghis Khan and his successors actively patronized religious practices and rituals. They sought the support and guidance of shamans, who performed ceremonies and offered sacrifices to appease the gods and ensure their success in battles. These religious practices were deeply intertwined with the military campaigns and conquests of the Mongol Empire.

Impact on Conquests:
The belief in the divine mandate to rule the world had a significant impact on the Mongol conquests. Genghis Khan and his armies were driven by a sense of destiny and a mission to spread their rule to all corners of the earth. This belief instilled a sense of unity, determination, and fearlessness among the Mongol warriors, making them formidable opponents on the battlefield.

Conclusion:
In conclusion, Genghis Khan believed that he had a mandate from God to rule the world. This belief was deeply rooted in Mongol culture and religion, and it played a crucial role in their conquests and expansion. Genghis Khan's divine mandate provided him with the necessary legitimacy and justification to lead his armies and establish one of the largest empires in history.