Possible Clues:

• Pre-Renaissance period
• Period after the fall of the Roman Empire
• Period of ignorance without the Sun and Times?
• Primitive time
• Period after the fall of Rome
• Period following Rome's fall (2 words)
• Times delighted when the record is blank?
• Period of history between classical antiquity and the Italian Renaissance
• Night-times of long ago?
• Relatively unproductive time perhaps in eg Dakar, capital of Senegal