Firoz Shah was dead. The Islamic historians Sirhindi and Bihamadkhani provide the detailed account of this period. These civil wars were primarily between different factions of Sunni Islam aristocracy, each seeking sovereignty and land to tax dhimmis and extract income from resident peasants. Firuz Shah Tughluq's favorite grandson died in 1376. Thereafter, Firuz Shah sought and followed Sharia more than ever, with the help of his wazirs. He himself fell ill in 1384. By then, Muslim nobility who had installed Firuz Shah Tughluq to power in 1351 had died out, and their descendants had inherited the wealth and rights to extract taxes from non-Muslim peasants. Khan Jahan II, a wazir in Delhi, was the son of Firuz Shah Tughluq's favorite wazir Khan Jahan I, and rose in power after his father died in 1368 AD. The young wazir was in open rivalry with Muhammad Shah, the son of Firuz Shah Tughluq. The wazir's power grew as he appointed more amirs and granted favors. He persuaded the Sultan to name his great-grandson as his heir. Then Khan Jahan II tried to convince Firuz Shah Tughlaq to dismiss his only surviving son. Instead of dismissing his son, the Sultan dismissed the wazir. The crisis that followed led to first civil war, arrest and execution of the wazir, followed by a rebellion and civil war in and around Delhi. Muhammad Shah too was expelled in 1387 AD. The Sultan Firuz Shah Tughluq died in 1388 AD. Tughluq Khan assumed power, but died in conflict. In 1389, Abu Bakr Shah assumed power, but he too died within a year. The civil war continued under Sultan Muhammad Shah, and by 1390 AD, it had led to the seizure and execution of all Muslim nobility who were aligned, or suspected to be aligned to Khan Jahan II. While the civil war was in progress, predominantly Hindu populations of Himalayan foothills of north India had rebelled, stopped paying Jizya and Kharaj taxes to Sultan's officials. Hindus of southern Doab region of India (now Etawah) joined the rebellion in 1390 AD. Sultan Muhammad Shah attacked Hindus rebelling near Delhi and southern Doab in 1392, with mass executions of peasants, and razing Etawah to the ground. However, by then, most of India had transitioned to a patchwork of smaller Muslim Sultanates and Hindu kingdoms. In 1394, Hindus in Lahore region and northwest South Asia (now Pakistan) had re-asserted self-rule.