The Encyclopaedia of Islam Online (EI Online) is a unique and invaluable reference tool, an essential key to understanding the world of Islam. Brill was the first academic publisher to publish an encyclopedia on Islam, and the Encyclopaedia remains a cornerstone of its publishing program. The Encyclopaedia is a large-scale collective reference work compiled by the most prominent scholars in the field, touching on all aspects of Islam from the time of the Prophet to the present day