Here are Normal Christianity blog posts we have available covering the Second Century of the Church’s existence (100 to 200 AD):

Church History, Part 9

Church History, Part 10

Church History, Part 11

Church History, Part 12

Church History, Part 13

Church History, Part 14

Church History, Part 15

Church History, Part 16

Church History, Part 17

Church History, Part 18

Church History, Part 19

Church History, Part 20

Here is a link that will take you back to the Church History Blog Post Room, if you want to “visit” a different Century:

The Church History Blog Post Room