This book is a compilation of four books which deal with the lives and works of the four imams who founded the four great canonical schools of thought of Islamic fiqh; Imam Abu Hanifah, Imam al-Shafi'i, Imam Malik Ibn Anas & Imam Ahmad Ibn Hanbal. The book was originally written in Arabic by the great Egyptian scholar and theologian Muhammad Abu Zahra and is presented in English for the first time. In this book, there is a comprehensive, in depth analysis of the four Sunni madhabs and their founders, giving details of their biography and the methods they used in reaching their legal conclusions. This is particularly important important in the world today when many thousands of Muslims find themselves in a situation where there is not enough knowledge and therefore, no traditional allegiance to a particular madhab. As a result of this ignorance, there is also a great deal of futile disagreements amongst the Muslims. This work therefore has been long overdue in the English language and will be a milestone in bridging the gap amongst the Muslims and uniting them. It makes a stimulating and enriching read for all who are interested in deepening their knowledge of Islam.