As
you very well know, the 23rd day of March commemorates for all
Ahmadi Muslims worldwide an exceptional day in the history of mankind when a
devout and highly spiritual soul, i.e. the Promised Messiah Hazrat Mirza Ghulam
Ahmad (as) took from his companions the oath of allegiance. This major event
happened in the year 1889 after the Promised Messiah (as) had received repeated
revelations from Allah to do so.
Hazrat
Mirza Ghulam Ahmad of Qadian (as) thus founded Ahmadiyya Movement in Islam and
went on throughout his life on earth to devote his time and energy to calling
people to Allah and to share with them all the blessed revelations he used to
received from Allah.
THE FAMILY BACKGROUND OF THE PROMISED MESSIAH (AS)

Mirza
Hadi Baig was granted a large extent of land by the emperor and he thus selected
an unpopulated area thereof, some seventy miles northeast of Lahore, to settled
down with his clan. He founded the town which he named Islampur and
became its overall Chief and Qazi (Islamic Magistrate). With the passage
of time, the name Islampur went through a series of changes and came to
be called Islampur Qadi, and then Qadi, and finally it became
known as Qadian, it's present day
appellation.