A person who employs or retains an attorney, or counsellor, to appear for him in courts, advise, assist, and defend him in legal proceedings, and to act for him in any legal business. McCreary v. Iloopes, 25 Miss. 428; McFarland v. Crar.v, 0 Wend. (N. Y.) 297; Cross v. Riggins, 50 Mo. 335