Muhammad of Ghor (1160–1206) Ghurid Sultan
He therefore " sued for pardon, and placed the ring of servitude in his ear," and agreed to pay tribute...
About the capture of Gwalior. Hasan Nizami. Elliot and Dowson, Vol. II : Elliot and Dowson, History of India as told by its own Historians, 8 Volumes, Allahabad Reprint, 1964. pp. 227-228 Also quoted in Jain, Meenakshi (2011). The India they saw: Foreign accounts.