Who was the founder of the poppy?

Answer 1

There was no"founder of the poppy" -Poppies are a natural thing.
Poppies were brought to peoples attention after Canadian Army doctor John Macrae saw how they blossomed over the fields where dead soldiers were buried, and wrote his now famous poem, "In Flanders fields"

In Flanders fields the poppies blow
Between the crosses, row on row,
That mark our place; and in the sky
The larks, still bravely singing, fly
Scarce heard amid the guns below.

This poppy is worn in remembrance of the war dead in all Allied countries since World War 1.