委托人

client, principal

noun Rare #31,491
client, principal A person who entrusts someone else to act on their behalf; in legal contexts, a client of a lawyer.
CH: 律师正在和委托人谈话。
EN: The lawyer is talking with the client.

您的委托人被释放了吗

Has your client been released?

— 坠落的审判 (2023)