A 7500 mile journey across Asia along the old Silk Road

...as you can see. Ismail Samani was born Abu Ibrahim Isma'il Ahmad and was the Samanid emir of Transoxiana [892-907] and of Khorasan [900-907]. It was Ismail Samani's ancestor Saman Khuda who first renounced Zoroastrianism and embraced Islam.