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