Returning to the recurrent theme of resilience, it is suggested that the ecological model of adaptive cycles helps to understand the responses of the post-antique world to crisis. Rather than rejecting the old model of civilisation based on cities, memories of the past are constantly used both as providing material for new adaptations, and as a way of associating contemporary realities with those of the classical world. The writings of the authors discussed in this book as seen as part of this process, of transmitting and adapting memories.