Riddle me this, riddle me that...

King Sized Puzzle
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Five hundred begins it, five hundred ends it,
Five in the middle is seen;
First of all figures, the first of all letters,
Take up their stations between.
Join all together, and then you will bring
Before you the name of an eminent king.

Вообще-то это надо было отгадывать, а не всякую ерунду в комментариях постить. Загадка-то детская...