Final answer:
The 'good fortune' of the 'Fortunate Islands' was their peaceful and prosperous lifestyle.
Explanation:
The 'good fortune' that happened to the people referred to as the 'Fortunate Islands' was their peaceful and prosperous existence as described in the historical account provided. These people were depicted as living in a state of happiness, focusing on festivals, dancing, singing, and love, residing in wooden houses with well-built towns.
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