Well, that caught me out. I will be more careful next time if it mentions Constantinople or Byzantium.
Exactly my sentiments! Hope you flagged it as confusing/ incorrect? They can't have it both ways.
Because English people say Beijing?
Hungarians (and Germans) say Peking.
And Chinese people say 北京.
The name you use depends on which language you are currently speaking.
English people say Peking and Beijing. The Chinese government wants people to say "Beijing" because "北京" is pronounced Beijing in Mandarin Chinese.