Kritovoulos, History of Mehmed the Conqueror (written about 1465), Hungarian translation by K. Szabo 1875, sections 183 to 185; English by C. Riggs 1954, p. 59. Not an eyewitness
How it connects
This book or paper is where we read about
The 1453 omens were made by the volcano
This book or paper is where we read about
Kritovoulos: hailstorm during the icon procession, then a whole day of fog