Some records for the Duke of Rutland came under Belvoir Castle and it seems the records are at more than one archive.
https://discovery.nationalarchives.gov.uk/results/r?_dss=range&_ro=any&_q=%22Belvoir+Castle%22The transfer may be listed in the:-
Court Rolls if they have survived or the
Manor Rentals (depending upon the exact type of Tenure or holding)
Also look to see if the Transfer is listed in the:-
Copyhold Book, sometimes called the Admissions Book (if it has survived for the time period)
The Book of Fines or Fines Book (if it has survived)
If the Landowner / Manor Records have survived for that date and place you should be able to work out if this was a transfer of a:-
Rented property
Leased property (Manor Leases seen at another Manor were 25 years, but they vary)
Copyhold property (but not Freehold)
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Not sure if answered, but leaving his mark would strongly suggest he could not sign his name.
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I have seen the Tenant right reference in a Scottish Will saying Three Sisters had the Tenant right of their Mother's Freehold house (Mother owned her house outright). In that instance it meant I bequeath or give to my daughters my house ...
But because your transfer needs the Approval of the Landowner or Lord and you or the Will have not mentioned Copyhold, then without an examination of the Landowner or Manor records it is not always possible to confirm the exact Tenure, which may be Leased or another type.
My family owned land within a Manor that was "Copyhold" and that land could be left in a Will and when the Copyholder died, the person/s to whom it was left to, would apply to the Manor Court to have it transferred, but it was
not Freehold.
On the day of transfer it was the Custom of this Manor for the new Copyholder to appear in person and hold a piece of Straw in Court whilst the transfer took place.
Because my family built a house on the land, we had to ask the Manor if the property should be revalued and if so pay a percentage of the valuation.
If you couldn't pay any revaluation, you could sometimes sell or transfer to another person, subject to the Manor approval and rules.
Mark
Added: Reference to the Admissions Book (I forgot last night)