Who is known by the title of “Conqueror of Central Asia”?

Qutayba ibn Muslim (669–715/716 CE) is often called the "Conqueror of Central Asia." He was an Umayyad commander who expanded the Muslim empire into Transoxiana, which includes modern-day Uzbekistan, Tajikistan, and parts of Kazakhstan and Turkmenistan, during the early 8th Century.