What is the fine-grained topic of the following text: Due to the supra-national status marking the Pan-Hellenic sanctuaries, whose relevance was deeply interconnected with the concepts of competition and victory, they became a perfect scenario for the spread of political messages, for the creation of collective images to be proposed by single cities to the rest of the Hellenic world, for the celebration of triumph in all its aspects, from the war-success to the athletic one, from personal achievement to collective glorification. Only return the topic.
The role of Pan-Hellenic sanctuaries in spreading political messages and celebrating triumphs in ancient Greek society.