Saudi Arabia is one of the most important countries in the modern world. Not only does it possess some 25 per cent of the world's proven oil reserves, it also plays a crucial role in the wider Gulf region where over 50 per cent of proven reserves are located. Developments in Saudi Arabia will inevitably affect the economic well-being of the Western industrialised world, Japan and much of the Third World. At the same time, Saudi Arabia is ruled in a traditional way by an all-powerful king and royal family, and is one of the key countries of Islam, the Holy City of Mecca being within the country.