Kalan Kot Fort (Old name Tughlikabad) was built probably in 14th century along with Thatta. Sámúí deserves notice from the attempt which has been made to establish it as the celebrated Minnagara of the ancient geographers. It was the capital of the Jáms of the Samma Dynasty, and, according to the Tuhfatu-l Kirám, it was founded by Jám Pániya, under the Makli Hill, about three miles north-west of Thatta.
Subsequently, the fort of Tughlikábád was built by Jám Taghúr or Tughlik, on the site of the older Kalá-kot, about two miles south of Thatta; but that, as well as its predecessor, was left unfinished by its founder. By a strange vicissitude, the name of Tughlikábád is now comparatively forgotten, and that of Kalá-kot erroneously called Kalán-kot (the great fort), though for a time superseded, has restored the just claims of Rájá Kalá, and still attracts the attention of the traveller. Lt. Burton calls it Kallián-kot. I fear to differ from so good a local authority, but believe Kalá-kot to be more strictly correct.
The ruins of Sámúí, Samúiya, or Samma-nagar, “the city of the Sammas,” are to be traced near Thatta; and, under the wrong and deceptive spelling of Sa-minagar, have induced Col. Tod, Sir A. Burnes, and many who have too readily followed them—including even Ritter, who considers the question settled “incontestably,”— to recognise in that name the more ancient and more famous Minna-gara. The easy, but totally unwarrantable, elision of the first and only important syllable has led to this fanciful identification.