Sati, or suttee, was a funeral practice in some Asian communities where a recently widowed woman would commit suicide by immolating herself on her husband's funeral pyre. The practice can be traced back to the 4th century CE but evidence of royal wives participating only appears between the 5th-9th centuries CE. Sati was justified as a way to prevent widows from poisoning their husbands and taking new lovers, and it sometimes occurred in Sikh and non-Hindu communities in South Asia against the teachings of religious leaders. Sati remains illegal in India but isolated and unenforced cases were still reported into the 21st century. The 1987 Sati Prevention Act defines and outlaws the practice.