From Nikitas Choniates, 12th century Byzantine writer:

Thus the wretched Andronicus was arrested, bound, and thrown into a boat together with the women…

He was confined in the so-called prison of Anemas with two heavy chains weighing down his proud neck, the iron collar used to fetter caged lions, and his feet were painfully shackled. Bound in this fashion he was paraded before Emperor Isaakios (Isaac II Angelos – his cousin)…

He was slapped in the face, kicked on the buttocks…his teeth pulled out…he was even battered by women who struck him in the mouth with their fists…

Afterwards his right hand was cut off by an axe, he was cast again into the same prison without food and drink, tended by no one.

…one of his eyes was gouged out, and seated upon a mangy camel, he was paraded through the agora.

…there was no evil which they did…