Besides ibn Khordadbeh, the Radhanites are mentioned by name by a handful of sources. Ibn al-Faqih's early 10th century "Book of the Countries" mentions them, but much of ibn al-Faqih's information was derived from ibn Khordadbeh's work. "Sefer haDinim", a Hebrew account of the travels of Yehuda HaKohen ben Meir of Mainz, named Przemyśl and Kiev as trading sites along the Radhanite route. In the early 12th century, a French-Jewish trader named Isaac ben Dorbolo wrote that he traveled with Radhanite merchants to Poland.