The city burned by Peter the Hermit's unruly crusader mob when they reached it on their march through Byzantine territory — after which they also tried to loot a neighboring city before Byzantine heavy cavalry restored order.
What each episode says
Episode 2 (1 mention)
“The two armies met by the river Margus, near modern-day Belgrade.”
Episode 14 (1 mention)
The city burned by Peter the Hermit's unruly crusader mob when they reached it on their march through Byzantine territory — after which they also tried to loot a neighboring city before Byzantine heavy cavalry restored order.
“When the mob reached Belgrade, they burned it, then tried to loot a neighboring city”
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