Title: Middle Ages.
Question: In what year did Bulgaria become a vassal of the Ottomans?

Title: Antenna (radio).
Question: What is the term that refers to areas where an antennas radiation is zero?

Title: Premier League.
Question: The team which has the highest ranking in the Fair Play standings is guaranteed qualification for which qualifying round in the Europa League?

Title: Samurai.
Question:
What did hatamoto mean?