On the highest point of Taragarh fort stands the Dargah of Hazrat Miran Syed Husian Asghar Khangswar who was the governor of Ajmer after its conquest by Sultan Shahabuddin Ghori.. On the death of Qutubuddin Aibak in 1210 A.D., the Rathor and Chauhan Rajputs joined in a night attack on the Taragarh Fort when most of the men of Miran Saheb were out collecting taxes in the district, and the number of his garrison was, therefore, numerically very small. The Rajpurs thus massacred Miran Saheb and his garrison to a man on 18th Rajab.
According to Akhbar-ul-Akhyar, the first fort built on a hill in India was the fortress of Taragarh at Ajmer. Its unique defence and strength lie in the impregnable ruggedness and acclivity of the mountain upon which it is built. This ancient fort has seen many historic battles and nerve-wrecking sieges and has changed hands with the Rajput, Muslim, Maratha and the British conquerors during its long and checkered history. Ajameru Doorg, as it was originally called, was built by Raja Ajairaj Chauhan who was the king of Sapadlaksh territory having Sakambhari (now Sambhar as his capital in the early part of 6th century A.D. He also built the town of Ajmer and the village of Ajaisar, lying in the south of Foysagar lake, still commemorates his name.