PERSON@1 marched to LOCATION@1 , where he persuaded a number of PERSON@2 's supporters to acclaim him as caliph instead of PERSON@2 's son , PERSON@3 .

When PERSON@2 was assassinated in NUMBER@1 , PERSON@1 marched to LOCATION@1 There he persuaded a number of PERSON@2 's supporters to accept him as caliph instead of PERSON@2 's son , PERSON@3 .
