Sayyidi ʻAbd al-Raḥmān ibn Muḥammad al-Ṣaghīr ibn Muḥammad ibn Sayyidi ʿĀmir al-Akẖḍarī al-Bīsīkrī (in Arabic :سيدي عبد الرحمن بن محمد الصغير بن محمد بن سيدي عمرو الأخضري, born in 1512 in Biskra, Algeria and died in 1575 in Biskra, Algeria.
He was member of the Arab tribe Banu al-Akhdari, better known as Kabīlāt Al-Akẖḍariyah (Arabic: قبيلة الأخضرية)
He was the author of the highly popular didactic poem Al-Sullam al-murawnaq fī ʻilm al-manṭiq ("The Ornamented Ladder into the Science of Logic"). The 144-line poem, a versification of Al-Abhari's Kitab al-Isaghuji, outlines the principles of Aristotelian logic and explains how logic could be used to support the Islamic creed ('aqidah) and jurisprudence (fiqh). The work is studied across the Muslim world as a primer on logic and is often read in conjunction with al-Akhdari's own prose commentary.
He is also known to have written another work, "al-Jawhar ul-Maknun" or "Al-Jawahir al-Maknuna fi’l-ma’ni wa’l-bayan wa’l-badi’".
Al-Akhdari is the grandson of Sidi 'Amr al-Akẖḍarī Al Fihri. He is a member of the Arab tribe of the Banu al-Akhdari on behalf of the nobles Shereefian, their origins go back to the lineage of the Quraysh, which would make them Ahl al-Bayt (relatives and descendants of the Prophet Mohammed). They allegedly emigrated from Yemen or Western Arabia during the advent of Islam to immigrate to Algeria in 650.