One and halfscore, the posts are showing,
win, place, and show united is rejection as a marking;
the middle five of the whole, a type of setting,
the last eight is a man prone to writing.

Four in one, its middle two is a cannon booming,
with bursts of fire like a hundred stars dancing;
within that center is a country if you're looking,
a city you'll find,if you focus on the beginning.

Its first quarter is a letter with a greeting,
the next,a memory with one millennium missing;
then a duke,a prince or a king,
the last,an endless catch in the sport of fishing.

QUESTION: What is the word?