1236, at the end of the reign of Iltutmish (1211-1236)
"1318" [actually c.1330-35, under Muhammad Tughluq]
1398, under the later Tughluqs, when Timur invades and
sacks Delhi
1525, at the end of the reign of Ibrahim Lodi (1517-26)
All the maps are from "Historical Atlas of India," by Charles Joppen
(London: Longmans, Green & Co., 1907), scan by FWP, Oct. 2006; CLICK
ON ANY MAP FOR A LARGER SCAN