* Michael Angold, The Byzantine empire 1025 – 1204 ( Longman, 2nd edition, 1997 ).
* Michael Angold, The Byzantine empire 1025 – 1204 ( Longman, 2nd edition, 1997 ).
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* Michael Angold, The Byzantine empire 1025 – 1204 ( Longman, 2nd edition, 1997 ).
* Michael Angold, The Byzantine empire 1025 – 1204 ( Longman, 2nd edition, 1997 ).
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