Delhi, nowadays it's become a state as well as capital state of our country India, but in the ancient time it was an Kingdom. As you all that time India was ruled by king and sultans, who have absolute control over kingdom, peoples, army, economy etc. And as we all know our indian history was about more than 10,000 year old and also have many records of Ancient kings when India was divided into many huge and small kingdom.
According of Indian history Chandragupta maura is considered as first king of complete india which means (Akhand Bharat) but I am going to talk about the particular indian kingdom of Delhi. As we have heard that every invaders and ruler specially want to be the king of Delhi, but no one have ever given the answer that βBut why Delhi is important ?"
The actual purpose of the kings is the perfect geographical location because Delhi is surrounded by the other kingdom and places and at that time most of the places had dense forest and Northern part of India have covered with Himalayan mountains which makes difficult to invaders to conquer Delhi sultanate.
2.Business Hub:-
This is also the great reason for why the king wants Delhi as their place. At that time Wheat and rice was massively cultivated in Delhi and other nearby villages and because of which the trading business of rice and wheat got increased in Delhi and many businessman had seems the great opportunity to grow their business in Delhi. And that's also the actual reason that Delhi and and other neighbouring kingdoms are so rich.
3.Gold Coins were created in Delhi.
So, I hope now you understand that why Delhi was the business hub and one of the richest kingdom in ancient times? So coins or may be I can say currencies were made there as same as in modern delhi. Coins were made until the ruler of Tughlaq dynasty, Muhammed Shah Tughlaq had accounced to use copper coin as their currencies but copper is a cheap material which as be easily affordable and thereby people was started making fake copper coin to be rich but after some huge coin scams king Muhammed Shah again started gold coin as their currency.
This are the reasons that why Delhi was a great kingdom and every invader wants Delhi as their kingdom because if a person become Delhi's kingdom then he/she can easily control other kingdoms.
I hope you get to learn something new.
Thank you.