Tetarteron of Alexios IV Angelos (1203-1204)https://www.doaks.org/resources/online-exhibits/byzantine-emperors-on-coins/the-komnenoi-and-angeloi-1081-1204/tetarteron-of-alexios-iv-1203-1204https://www.doaks.org/@@site-logo/Sitewide Display 1200x630 02.03.23.png