In the mid-7th century AD, following the Muslim conquest of Persia, Islam spread into areas that would later become part of Russia. There are accounts of the trade connections between Muslims and the Rus', apparently people from the Baltic region who made their way towards the Black Sea through Central Russia. During his journey to Volga Bulgaria in 921–922, Ibn Fadlan observed the Rus', claiming that some had converted to Islam. "They are very fond of pork and many of them who have assumed the path of Islam miss it very much." The Rus' also relished their "nabidh", a fermented drink which Ibn Fadlan often mentioned as part of their daily fare.