▁cal i ph ▁in ▁ 6 5 7 ▁and ▁went ▁to ▁war ▁against ▁Muhammad ' s ▁son - in - law ▁and ▁cousin , ▁the ▁r uling ▁cal i ph ▁Ali , ▁cl ash ing ▁at ▁the ▁Battle ▁of ▁S iff in . ▁Mu aw iy ah ▁also ▁declared ▁his ▁son , ▁Y az id , ▁as ▁his ▁successor ▁in ▁bre ach ▁of ▁a ▁treat y ▁with ▁Hass an , ▁Muhammad ' s ▁grand son . ▁Another ▁of ▁Muhammad ' s ▁grands ons , ▁Hus ay n ▁ibn ▁Ali , ▁would ▁be ▁killed ▁by ▁Y az id ▁in ▁the ▁Battle ▁of ▁Kar b ala . ▁Further ▁Sh ia ▁Im ams , ▁such ▁as ▁Muhammad ' s ▁great - grand son , ▁Ali ▁ibn ▁Hus ay n ▁Z ay n ▁al - Ab id in ▁would ▁be ▁killed ▁at ▁the ▁hands ▁of ▁r uling ▁Um ay y ad ▁cal i ph s . ▁ ▁Bah á ' í ▁opinions ▁Ask ed ▁for ▁an ▁explanation ▁of ▁the ▁prop he cies ▁in ▁the ▁Book ▁of ▁Re vel ation ▁( 1 2 : 3 ), ▁` Ab du ' l - B ah á ▁suggests ▁in ▁Some ▁Answer ed ▁Question s ▁that ▁the ▁" gre at ▁red ▁drag on , ▁having ▁seven ▁heads ▁and ▁ten ▁horn s , ▁and ▁seven ▁crow ns ▁upon ▁his ▁heads ," ▁refers ▁to ▁the ▁Um ay y ad ▁cal i ph s ▁who ▁" rose ▁against ▁the ▁religion ▁of ▁Pro ph et ▁Muhammad ▁and ▁against ▁the ▁reality ▁of ▁Ali ". ▁ ▁The