Which entity is this text about?

According to most sources, Omar was born sometime between 1950 and 1962 in a village in Kandahar Province, Kingdom of Afghanistan (in present-day Kandahar Province or Uruzgan Province). Some suggest his birth year as 1950 or 1953, or as late as around 1966. According to a "surprise biography" published by the Taliban in April 2015, he was born in 1960. His exact place of birth is also uncertain; one possibility is a village called Nodeh near the city of Kandahar.

On 4 April 1996, supporters of Mullah Omar bestowed on him the title Amir al-Mu'minin ('myr lmw'mnyn, "Commander of the Faithful"), after he donned a cloak alleged to be that of Muhammad that was locked in a series of chests, held inside the Shrine of the Cloak in the city of Kandahar. Legend decreed that whoever could retrieve the cloak from the chest would be the great Leader of the Muslims, or "Amir al-Mu'minin". In September 1996, Kabul fell to Mullah Omar and his followers. The civil war continued in the northeast corner of the country, near Tajikistan. The nation was named the Islamic Emirate of Afghanistan in October 1997 and was recognized by Pakistan, Saudi Arabia and the United Arab Emirates. Described as a "reclusive, pious and frugal" leader, Omar very seldom left his residence in the city of Kandahar, and visited Kabul only twice between 1996 and 2001 during his tenure as ruler of Afghanistan. In November 2001, during a radio interview with the BBC, Omar stated: "All Taliban are moderate. There are two things: extremism ['ifraat', or doing something to excess] and conservatism ['tafreet', or doing something insufficiently]. So in that sense, we are all moderates - taking the middle path." According to Pakistani journalist Rahimullah Yusufzai, Mullah Omar stated in the late 1990s, "We have told Osama [Bin Laden] not to use Afghan soil to carry out political activities as it creates unnecessary confusion about Taliban objectives." In 1998, despite receiving a personal invitation from Saudi Arabia's ruler, King Fahd, Omar refused to make a pilgrimage to Mecca and wouldn't do one in his lifetime. Mullah Omar was also "Head of the Supreme Council of Afghanistan".
Mohammed Omar