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Mukasir:
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During the period of Syedna Ali, differences were created within the tribe of Ya'abur. Syedna Ali strived to resolve their differences, but, they did not pay any attention to his advice. Finally, they killed their chief Sultan Hatim ibne Saba. Syedna moved to Sana'a, where he remained busy with the guidance of Moomineen. 
 
During the period of Syedna Ali, intense rivalries and fightings continued among different clans for dominance. Syedna remained aloof to all these stuggles of domination.
 
  • During his period, Mohammed Ghori conquered Delhi.
  • Qutubuddin Aibak, the deputy of Ghori on Delhi, became Sultan of Delhi after the death of Ghori. 
  • Fourth crusade was fought during this period.