Answer:
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.
Double my number, I'm less than a score. Half of my number is less than four. Add one to my double when bakers are near. Days of the week are still greater, I fear.
What word is a plural, but when you add an "S" to the end, it becomes singular?
Take one out and scratch my head, I am now black but once was red.
A seed am I, three letters make my name. Take away two and I still sound the same.
What language does a billboard speak?