Five hundred begins it, five hundred ends it

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

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Five hundred begins it, five hundred ends it,
D = Roman numeral for 500
Five in the middle is seen;
V = Roman numeral for 5
First of all letters, the first of all figures,
A = the first letter
I = the first figure (number - in roman numerals)
Take up their stations between.
Join all together, and then you will bring
Before you the name of an eminent king.
DAVID