A trust is a legal relationship in which the holder of a right gives it to another person or entity who must keep and use it solely for another's benefit. In the Anglo-American common law, the party who entrusts the right is known as the "settlor", the party to whom the right is entrusted is known as the "trustee", the party for whose benefit the property is entrusted is known as the "beneficiary", and the entrusted property itself is known as the "corpus" or "trust property". A testamentary trust is created by a will and arises after the death of the settlor. An inter vivos trust is created during the settlor's lifetime by a trust instrument. A trust may be revocable or irrevocable; an irrevocable trust can be "broken" (revoked) only by a judicial proceeding.