Jawhar was a distinguished military officer and politician, renowned for his pivotal role as a Fatimid general of Croatian origin. He is best remembered for leading the successful conquest of the Maghreb and subsequently Egypt under the command of the fourth Fatimid Imam-Caliph, al-Mu'izz li-Din Allah.
During his tenure, Jawhar served as the viceroy of Egypt, a position he held until the arrival of al-Mu'izz in nine hundred seventy-three. His leadership was instrumental in consolidating Fatimid control over Egypt, ensuring a stable transition of power and governance.
After the arrival of al-Mu'izz, Jawhar chose to retire from public life, stepping away from the political arena until his passing. His legacy endures through various titles and nisbas, including al-Siqilli, al-Saqlabi, and al-Rumi, reflecting his diverse heritage and contributions.
Known by titles such as al-Katib and al-Qa'id, which translate to 'the Secretary' and 'the General' respectively, Jawhar's influence extended beyond military conquests, marking him as a significant figure in the history of the Fatimid dynasty.