What is associated with: a decree by this man in 1806 dissolved the 1000 year old holy roman empire?

Based on the clue 'a decorative item on a ships prow or a leader with...', what is the answer? Based on the clue 'a decorative ring of feathers around the neck of a...', what is the answer? Based on the clue 'a decorative sticker it is partly derived from cal...', what is the answer? Based on the clue 'a decrease in economic activity i couldnt bear it ...', what is the answer? Based on the clue 'a dedicated abolitionist thoreau was a conductor o...', what is the answer? What is associated with: a dedicated athlete is said to give this equal to 5550? Based on the clue 'a deductive system of algebra named after its crea...', what is the answer? What is referred to by 'a deep black 5'?