"Alexios IV Angelos or Alexius IV Angelus (Greek: Αλέξιος Δ´ Άγγελος) (c. 1182 – 8 February 1204) was Byzantine Emperor from August 1203 to January 1204. ...
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He was the son of Emperor Isaac II Angelus and his first wife, an unknown Palaiologina, who became a nun with the name Irene. His paternal uncle was Emperor Alexius III Angelus." - (en.wikipedia.org 12.12.2019)
