Sher Shah Suri improved the land revenue system by adopting Zabti-i-Har-Sai.
The land revenue system was introduced by Lord Cornwallis.
The land revenue system was started by Lord Cornwallis in 1973 AD.
When was the land revenue system introduced by Lord Cornwallis?
Which Suri ruler improved the land revenue system by adopting Zabti-i-Har-Sai?
Who started the land revenue system?