Answer:
c. Byzantine
Step-by-step explanation:
The Byzantine Empire was one of the most famous empires in Europe. It lasted between 395 CE to 1453.
Started under Emperor Constantine, Byzantine became majorly dominated in Christianity, and missionary work. It was known for being powerful, and usually the first line of defense against the Asians into western Europe. It is at the edge of Christian-dominated territory, and a window to outside religions.