Church history through the centuries

Gospels of Lothair, Tours, about 849–851. Christ at the center, with the four Gospels around him.
“Since we are surrounded by so great a cloud of witnesses, … let us run with endurance the race that is set before us, looking to Jesus.”
Hebrews 12:1–2
What each week contains
What we look for in every century
What we hope to achieve
Which person or event from church history do you most want to learn about, and why?