Nielsen describes the history of early European Muslims and outlines the causes and courses of twentieth-century Muslim immigration. Explaining how Muslim communities have developed in individual countries, the book examines their origins, their present-day ethnic composition, organizational patterns, and the political, legal and cultural contexts in which they exist. The book also provides a comparative consideration of issues common to Muslims in all Western European countries, namely the role of the family, and questions of worship, education, and religious thought.