Ya'qūb ibn al-Layth al-Saffār, was a coppersmith and the founder of the Saffarid dynasty of Sistan, with its capital at Zaranj. Under his military leadership, he conquered much of the eastern portions of Greater Iran consisting of modern-day Iran, Afghanistan, Turkmenistan, Uzbekistan, Tajikistan as well as portions of western Pakistan and a small part of Iraq. He was succeeded by his brother, Amr ibn al-Layth.

Amr ibn al-Layth or Amr-i Laith Saffari was the second ruler of the Saffarid dynasty of Iran from 879 to 901. He was the son of a whitesmith and the younger brother of the dynasty's founder, Ya'qub ibn al-Layth al-Saffar.