Ma'mun I Abu 'Ali was Khwarazm-Shah from 995 until his death. He was the founder of the Ma'munid dynasty, which lasted from 995 until 1017.

Ma'mun was originally the Samanid

Samanid

The Samani dynasty , also known as the Samanid Empire, or simply Samanids was a Persian state and empire in Central Asia and Greater Iran, named after its founder Saman Khuda, who converted to Sunni Islam despite being from Zoroastrian theocratic nobility...

 governor of northern Khwarazm, with his capital at Gurganj

Kunya Urgench

Konye-Urgench also known as Konya-Urgench, Old Urgench or Urganj, is a municipality of about 30,000 inhabitants in north-eastern Turkmenistan, just south from its border with Uzbekistan. It is the site of the ancient town of Ürgenç , which contains the unexcavated ruins of the 12th-century capital...

. In 995 he invaded southern Khwarazm and deposed the last Afrigid Shah (who was also a Samanid vassal), uniting the province under his rule. Upon his death in 997, his son Abu al-Hasan Ali

Abu al-Hasan Ali

Abu al-Hasan 'Ali was Khwarazm-Shah from 997 until his death. The second member of the Ma'munid dynasty, he was the son of Mamun I....

succeeded him.