Note 036
Acropolita (c. 14) affirms that Peter of Courtenay died by the sword
but from his dark expressions, I should conclude a previous captivity, 
The Chronicle of Auxerre delays the emperor's death till the year 1219; and Auxerre is in the neighbourhood of Courtenay.
The History Of The Decline And
Fall Of The Roman Empire
—Fall In The East
—Chapter 61