trustor

[ArthuraCig]

(law) a person who creates a trust by giving real or personal property in trust to a trustee for the benefit of a beneficiary; a person who gives such property is said to settle it on the trustee

[Miltensl]

A trustor is an individual or entity that creates a trust by transferring ownership of assets or property to a trustee, who then manages it for the benefit of a third party known as a beneficiary. The trustor, also known as a grantor, settlor, or donor, is essentially the person who establishes the trust.

[BertababySog]

A person who creates a trust.