This paper sheds light on the Mozarab Sisnando Davids, who played a significant role in the history of Al[1]Andalus, the Kingdom of Castile and León, and the establishment of the Kingdom of Portugal. Sisnando, also referred to as "Sheshnand" in Arabic sources, served in the court of ‘Abbādid of Sevilla (433-484 AH/ 1042-1091 AD), Ferdinand I of León (426–457 AH/ 1037–1065 AD), and Alfonso VI of Castile and León (457–502 AH/ 1065-1109 AD). He maintained amicable alliances with the Taifa Kings in Al[1]Andalus. Sisnando provided counsel to the kings of Castile and León throughout the Reconquista Wars. He gained renown for his astute political analysis of the dynamics shaping the Iberian Peninsula, particularly regarding the peaceful coexistence between Muslims and Christians