Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Michael I Rangabe (Mikhaēl I Rangabe) (died January 11, 844) was Byzantine Emperor from 811 to 813. Michael was the son of the patrician Theophylaktos Rangabe, the admiral of the Aegean fleet. He married Prokopia, the daughter of the future Emperor Nikephoros I, and received the high court dignity of kouropalatēs after his father-in law's accession in 802.