Who made the stupa of kushinara?

The stupa at Kushinara, also known as Kushinagar, is believed to have been constructed during the reign of Emperor Ashoka in the 3rd century BCE. Ashoka, a prominent Mauryan emperor, played a significant role in spreading Buddhism and is known for building stupas and other monuments to honor the Buddha. The Kushinara stupa marks the site of the Buddha's parinirvana, or final passing away.