AHC Janissaries remains an elite unit

What is a POD required to keep the Janissaries as an elite military unit into the 19th century? Perhaps fulfilling a role similar to the European Guards regiments?
 

Delvestius

Banned
Ottomans win the siege of Vienna and the Millet system remains a successful way of military payment. With this, they remain a powerful entity into the nineteenth century, their Janissary remaining the most elite of their Infantry.

I'v always preferred the golden age Sipahi.
 
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