These are all roles that are found within a Trust
Trustee: is someone tasked with overseeing the assets held by a Trust. A Trustee must act in accordance with the Trust Deed (the document which establishes theTrust and outlines what its purpose and operations are).
A beneficiary is someone who benefits from the assets held by the Trust. The Trust deed outlines how the beneficiary might benefit.
A Settlor is the person who first provided the assets to the Trust, established the Trust Deed and selected the Trustees.
All Trustees, Beneficiaries and Settlors are named in the Trust Deed.