This document provides an overview of the historical development of Islamic law (fiqh) and the schools of legal thought (madh-habs) in Islam. It discusses the evolution of fiqh in six stages: 1) Foundation, 2) Establishment, 3) Building, 4) Flowing, 5) Consolidation, and 6) Stagnation and Decline. It also examines the main schools of thought that emerged, including the Hanafi, Maliki, Shafi'i, and Hanbali madh-habs. The document aims to help readers understand the historical factors behind fiqh and differences between legal rulings, in order to promote unity within the Islamic legal tradition.