On April 26, 1846, Ahmad Bey signed a historic emancipation decree making the Regency of Tunis the first in the modern Islamic world to formally abolish the longstanding institution of slavery. While the decree marked the first of such unprecedented measures, attracting a barrage of compliments from anti-slavery societies around the globe, it conflicted with the local notions of enslaving practices and thus prompted an earnest process of legitimation for the formal abolition of slavery before the Majlis al Shari (Sharia Council for Judicial Ordinance), without which abolition would have remained culturally and politically contentious. The paper will assess the socio-cultural context and the plural Islamic legal framework that informed both Ahmad Bey's argument favoring abolition and the divergent responses and attitudes of the religious establishment toward the abolition decree.