LLM1093929:
Gottfried Wilhelm Leibniz, German mathematician, presenting his new research into differential calculus. (chromolitho), French School, (19th century) / Bridgeman Images
LLM1093340:
The young Alexios IV Angelos brings Baldwin IX, Count of Flanders, to liberate his brother, Fourth Crusade, 1201 (chromolitho), French School, (19th century) / Bridgeman Images