"Abu al-‘Abbās ‘Abdu'llāh ibn Muhammad al-Saffāḥ (Arabic: أبو العباس عبد الله بن محمد السفّاح; 721/722 – 10 June 754) usually known as Abul ‘Abbas as-Saffaḥ or ...
simply as As-Saffah was the first caliph of the Abbasid Caliphate, one of the longest and most important caliphates (Islamic dynasties) in Islamic history. (Due to different methods of romanising Arabic names, the spellings As-Saffah and Al-Saffah may both be found.)
Abū'l ‘Abbās' laqab or caliphal title was As-Saffāḥ (السفّاح), meaning "the Blood-Shedder" for his ruthless tactics and perhaps also to instill fear in his enemies." - (en.wikipedia.org 12.12.2021)
