The conference on the theme ‘Mount Athos in the 15th and 16th Centuries’, which was held in November 2011, examined the period when Athos and its external possessions gradually passed from Byzantine to Ottoman rule, leading to a multidimensional crisis and a series of reverses and adjustments (15th century). This period was soon followed, from the early years of the 16th century, by a period of renewal and prosperity. The conference provided answers to crucial questions, such as the nature and extent of the 15th-century crisis, the mechanisms for adjustment to the reality of Ottoman rule, the continuities and breaks in the institutions (administrative and financial) and the extent of the revival in the 16th century, together with its different aspects and the factors that brought it about.