Allah decreed unique challenges to appear during the period of the Rightly Guided Khalifahs and showed to us via their decisions, which they learnt earlier from the noble Prophet, how to behave in such times in future ranging from times of immense piety and prosperity to times of severe Fitnah and divisions and how to once again restore the glorious period! Hence learning the life and timeline of the period of the Rightly Guided Khalifahs is a priceless treasure for us!