Krum's Advances — Territorial expansion of Bulgaria during the reign of Khan Krum (803-814)
During his reign the Bulgarian territory doubled in size, spreading from the middle Danube to the Dnieper and from Odrin to the Tatra Mountains.
Photo Credit: By Kandi - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=3211315

Solidus of Leo V the Armenian —
Photo Credit: By Classical Numismatic Group, Inc. http://www.cngcoins.com, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=11751738

St. Ignatius of Constantinople —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=20680059

Gold solidus of Theophylactus. 811-813. — Solidus (Gold, 4.40 g 6). ΘEOFVLACTOS DESP’E Beardless bust of Theophylactus facing, wearing loros and crown with cross, and holding a globus cruciger in his right hand and a cross tipped scepter in
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=33286179

Coronation of the Emperor Michael I — By the Patriarch, as depicted in the Madrid Skylitzes
Photo Credit: By Anonymous - The Madrid Skylitzes; Vasiliki Tsamakda, The Illustrated Chronicle of Ionnes Skylitzes in Madrid, (Leiden, 2002), Public Domain, https://commons.wikimedia.org/w/index.php?curid=11200449

Michael I Rangabe, from the Madrid Skylitzes —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=25462230

Staurakios as co-emperor on a gold solidus —
Photo Credit: By Classical Numismatic Group, Inc. http://www.cngcoins.com, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=27481143

Fresco of St. Photius —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=36741907

Khan Krum feasts while a servant brings the skull of Nikephoros I fashioned into a drinking cup. —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=2370571

Khan Krum —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=10714578

Flag of Bulgaria —
Photo Credit: