Sanchi is known for its Stupas, monasteries, temples and pillars dating from the 3rd century B.C. to the 12th century A.D. The most famous of these monuments, the Sanchi Stupa 1, was originally built by the Mauryan Emperor Ashoka, the then governor of Ujjayini, whose wife Devi was the daughter of a merchant from adjacent Vidisha. Their son Mahindra and daughter Sanghamitra were born in Ujjayini and sent to Sri Lanka, where they converted the King, the Queen and their people to Buddhism.