From Smithsonian:
Part of the Taj Mahal’s beauty derives from the story the stones embody. Though a tomb for the dead, it is also a monument to love, built by the Mughal emperor Shah Jahan, fifth in a line of rulers who had originally come as conquerors from the Central Asian steppes. The Mughals were the dominant power on the Indian subcontinent for much of the 16th to 18th centuries, and the empire reached its cultural zenith under Shah Jahan. He constructed the Taj (which means “crown,” and is also a form of the Persian word “chosen”) as a final resting place for his favorite wife, Arjumand Banu, better known as Mumtaz Mahal (Chosen One of the Palace). A court poet recorded the emperor’s despair at her death in 1631, at the age of 38, after giving birth to the couple’s 14th child: “The color of youth flew away from his cheeks; The flower of his countenance ceased blooming.” He wept so often “his tearful eyes sought help from spectacles.” To honor his wife, Shah Jahan decided to build a tomb so magnificent that it would be remembered throughout the ages. For more than 15 years, he directed the construction of a complex of buildings and gardens that was meant to mirror the Islamic vision of Paradise.
More here.