Mumtaz Mahal bore him 8 daughters and 4 sons.
When Mumtaz Mahal was still alive, she extracted four promises from the emperor: first, that he build the Taj; second, that he should marry again; third, that he be kind to their children; and fourth, that he visit the tomb on her death anniversary. He kept the first and second promises. Construction began in 1631 and was completed in 22 years. Twenty thousand people were deployed to work on it. The material was brought in from all over India and central Asia and it took a fleet of 1000 elephants to transport it to the site. It was designed by the Iranian architect Ustad Isa and it is best appreciated when the architecture and its adornments are linked to the passion that inspired it. It is a "symbol of eternal love".