According to Anand A. Yang, one model proposes taking into account the association of "sati" with the warrior elite in particular, "sati" only became really widespread during the Muslim invasions of India, and the practice of "sati" now acquired an additional meaning as a means to preserve the honour of women whose men had been slain. Jogan Shankar meanwhile states that sati gained more value during the period of Muslim conquests, especially with the variant of mass sati called "jauhar", practiced especially among the Rajputs. This theory gains substance considering that the practice turned prevalent from 7th century onwards and declined to its elimination in 17th century to gain resurgence in Bengal in 18th century.