the West/Latins/Catholic Church committed, arguably, one of the most stupid mistakes in history by conducting the Fourth Crusade against it.
Speaking of which, Umberto Eco - perhaps best known for his
Il nome della rosa (The Name of the Rose, 1980) - later wrote
Baudolino (translated with the same title, 2000). The book isn't his best received, nor is it strictly historical, but the story is set in the spring of 1204 in Constantinople as the Fourth Crusade is about to topple the Roman Empire. The publisher explains: 'Amid the carnage and confusion, one Baudolino saves a historian and high court official from certain death at the hands of the crusading warriors and proceeds to tell his own fantastical story.'
Tracy Barrett's
Anna of Byzantium (2000) is perhaps a more straightforward historical novel, focussed on the exploits of Ánna Komnēnḗ (1083-1153); daughter of emperor Alexios I and author of the unique work
Alexiad about her father's reign. In this novel she, as per the publisher, 'will be no one's puppet. Almost overnight, Anna sees her dreams of power wrenched from her and bestowed on her little brother. Bitter at the betrayal, Anna waits to avenge herself, and to seize what is rightfully hers.'
While not a novel, the ancient historian Procopius of Caesarea (c. 500-560) saved his more scathing (and juicy) remarks for his
Secret Histories. A favourite of scholars since its rediscovery, this is a work that, as Wikipedia explains: 'reveals an author who had become deeply disillusioned with the emperor Justinian and his wife, Empress Theodora, as well as Belisarius, his former commander and patron, and Antonina, Belisarius' wife. The anecdotes claim to expose the secret springs of their public actions, as well as the private lives of the emperor, his wife and their entourage.' This is, as said, not historical fiction, but it often reads like an engrossing narrative in a style familiar to readers of earlier ancient historians. The
Secret Histories, like Ánna's
Alexiad, is also written by someone from within the halls of Roman power. There should be plenty of translations available for free online to see if it is something you'll enjoy reading.