"After he had reached the capital he sent, in A.H. 6324 (1234 A.D.), the army of Islam [went] towards Malwa and took the fort and city of Bhilsa.5 There was a temple there which was three hundred years in building. It was about one hundred and five gaz high. He demolished it. From thence he proceeded to Ujjain, where there was a temple of Mahakal, which he destroyed, as well as the image of Bikaramajit, who was king of Ujjain, and reigned 1316 years before this time. The Hindu era dates from his reign. Some other images cast in copper were carried with the stone image of Mahakal to Delhi.."
January 1, 1970
https://en.wikiquote.org/wiki/Minhaj-i-Siraj