While the general public admired Jalal-ud-din as a kind-hearted and sincere person, a section of nobles despised him as a weak ruler. In August 1290, Balban's nephew Malik Chajju Kashli Khan, who now headed the former royal family, staged a revolt against Jalal-ud-din at Kara. Chajju seems to have opted for the governorship of the easternmost province of Kara-Manikpur to remain away from imperial control, and possibly, because he hoped to seek support from his cousin
Bughra Khan (father of Qaiqabad), who had become an independent ruler of the eastern
Bengal region in 1287. Chajju styled himself as Sultan Mughisuddin, and declared his independence. As a mark of his sovereignty, he issued his own coins, and had the
khutba read in his name. Ali Hatim Khan, the governor of
Awadh, as well as other older nobles appointed in the eastern region, supported him. Chajju was also supported by a number of
Hindu chiefs of the Gangetic plains, who had not paid their tribute for some years, and who swore allegiance to Balban's family. Under these circumstances, Jalal-ud-din's loyal officers in the
Ganga-Yamuna Doab region started withdrawing from the region. Chajju was confident that he enjoyed more support than Jalal-ud-din, who was yet to find favour among the old nobles of Delhi and its neighbouring areas. Therefore, he marched towards Delhi along the left bank of the Ganges River, and then the
Ramganga River. He probably planned to enter Delhi from
Amroha area. At
Badaun, his supporters Malik Bahadur and Alp Ghazi joined him with their troops. Jalal-ud-din set out to crush the revolt after appointing his eldest son, who held the title
Khan-i Khanan, in-charge of Delhi. He led his army towards Badaun via
Koil (modern Aligarh). The vanguard of his army, led by his second eldest son Arkali Khan, marched ahead of the rest of the army, and spotted Chajju's army on the other side of the Ramganga River. Chajju's soldiers had seized all the boats, so Arkali Khan's contingent could not cross the river. At night, Arkali Khan sent a raiding party to Chajju's camp on
rafts and
skiffs. The raids caused panic among Chajju's soldiers, who deserted their camp, and moved northwards. Arkali Khan plundered the deserted camp for two days, and then pursued the enemy. He came across Chajju's army at a Ramganga river crossing, and fought an indecisive battle. Meanwhile, Jalal-ud-din's army crossed the Ganges river at Bhojpur (near Farrukhabad), and engaged Chajju's supporters in another battle. At night, an agent of Chajju's Hindu supporter Bhim Deva (Biram Deva Kotla according to
Tarikh-i Mubarak Shahi) informed him that Jalal-ud-din would attack his army from rear. Chajju then secretly left the camp with some of his followers. In the morning, Arkali Khan crossed the river, and easily defeated the remaining army of Chajju. Chajju's supporters Alp Ghazi and Bhim Deva were killed, while Malik Masud and Malik Muhammad Balban were captured. The rest of Chajju's army then surrendered. Chajju himself took shelter in a walled village, but the village headman turned him over to Jalal-ud-din's army. Aakali Khan then joined Jalal-ud-din, and the combined imperial army marched to the eastern districts to punish the chiefs who had supported Chajju. Some chiefs, such as that of Rupal, surrendered and saved themselves by offering heavy
tributes. Others, such as that of Kahsun, faced plundering raids. The Hindu rebels were executed, and the Muslim rebels of Indian origin were sold as slaves. Jalal-ud-din treated the Turkic Muslim rebels kindly, despite objections by his nephew Ahmad Chhap. When the imprisoned rebel nobles were brought to his camp in chains, he disapproved of their mistreatment. He ordered them to be released, dressed well and entertained. He invited the high-ranking rebel nobles, such as Amir Ali Sarjandar, to a feast. Even Malik Chajju, who was captured a few days later, was sent to an honourable confinement at Multan instead of being executed; his associates were released. Jalal-ud-din openly praised the rebels for their loyalty to their deceased master Balban. When Ahmad Chhap objected to such leniency, Jalal-ud-din declared that he was not habituated to killing Muslims, and argued that the pardoned nobles would be grateful to him and remain loyal to him. == Mongol invasion ==