In addition, the Somali community has produced numerous important Islamic sheikhs and clerics over the centuries, many of whom have significantly shaped the course of Muslim learning and practice in the Horn of Africa, the Arabian Peninsula, and well beyond. Among these Islamic scholars is the 14th-century Somali theologian and jurist Uthman bin Ali Zayla'i of Zeila, who wrote the single most authoritative text on the Hanafi school of Islam, consisting of four volumes known as the ''Tabayin al-Haqa'iq li Sharh Kanz al-Daqa'iq''.