I am looking for approximate number of people that died in Europe during 541–542 Plague of Justinian.
All wiki has is
Modern scholars believe that the plague killed up to 5,000 people per day in Constantinople at the peak of the pandemic and
Frequent subsequent waves of the plague continued to strike throughout the 6th, 7th and 8th centuries, with the disease becoming more localized and less virulent. One high estimate is that the Plague of Justinian killed as many as 25 million people across the world
If I would say that it killed 5 mil how wrong would I be.