Name The Year: Charles Boycott, estate manager in Ireland, caused boycotts, born?

Questions

Who was the first US President to have a brother in the Senate?

Under what name did 18th Century frenchman Francois-marie Arouet write?

How many years make a lustrum?

How many different squares are open to a knight making the very first move in a game of chess?

Which is the only US State due south of Alaska?